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lesson 'Another unusual Travel problem (Arnold's problem on two walking old women)' in section 'Travel_Word_Problems'
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lesson 'Amazing calculations with fractions that contain quadratic irrationalities in denominators' in section 'Polynomials-and-rational-expressions'
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lesson 'SOLVING ABSOLUTE VALUE EQUATIONS' in section 'absolute-value'
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lesson 'What is a Matrix?' in section 'Matrices-and-determiminant'
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lesson 'Determinant of a 2x2 matrix' in section 'Matrices-and-determiminant'
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lesson 'HOW TO solve system of linear equations in two unknowns using determinant (Cramer's rule)' in section 'Matrices-and-determiminant'
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lesson 'Solving systems of linear equations in two unknowns using the Cramer's rule' in section 'Matrices-and-determiminant'
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lesson 'The New AC Method to factor trinomials' in section 'test'
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lesson 'Solving word problems by the Cramer's rule after reducing them to systems of linear equations in two unknowns' in section 'Matrices-and-determiminant'
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lesson 'Solving systems of non-linear equations in two unknowns using the Cramer's rule' in section 'Matrices-and-determiminant'
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lesson 'OVERVIEW of LESSONS on determinants of 2x2 matrices and Cramer's rule for systems in 2 unknowns' in section 'Matrices-and-determiminant'
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lesson 'Mean and Standard Deviation Part 1' in section 'Describing-distributions-with-numbers'
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lesson 'Determinant of a 2x2-matrix and the area of a parallelogram and a triangle' in section 'Matrices-and-determiminant'
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lesson 'Solving systems of linear equations in 3 unknowns by the Substitution method' in section 'Matrices-and-determiminant'
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lesson 'BRIEFLY on solving systems of linear equations in 3 unknowns by the Substitution method' in section 'Matrices-and-determiminant'
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lesson 'Solving systems of linear equations in 3 unknowns by the Elimination method' in section 'Matrices-and-determiminant'
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lesson 'BRIEFLY on solving systems of linear equations in 3 unknowns by the Elimination method' in section 'Matrices-and-determiminant'
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lesson 'Determinant of a 3x3 matrix' in section 'Matrices-and-determiminant'
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lesson 'Co-factoring the determinant of a 3x3 matrix' in section 'Matrices-and-determiminant'
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