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fractions subtraction addition signed numbers equations division polynomial operations multiplication factor factoring trinomial polynomial lcd linear variables systems linear word problems linear equations lcm literal equations solve mathematical expressions evaluation rectangular coordinate system cartesian coordinate system lines systems of linear equations decimal scientific notation polynomial expressions binomial operations multiplication formulas vertical gcf factorization substitution numbers and factors gcd equations of line slope calculation slopes of lines elementary algebra comparative phrases inequalities 2nd degree word problems sets commutative law prime factors prime number associative law reduction mixed fractions visual cross-multiplication exponents powers 2nd degree quadratic fraction (mathematics) numbers disvisibility cross multiplication order of operations arithmetic factoring formulas