$-3x+2x-x+4x-x+2x-x+4x$
$\frac{8y^4}{4y^3}$
$y=\frac{-2x+4}{x}$
$12^3y^4$
$2x\cdot3ax$
$c6c-4$
$\frac{x+7}{\left(x+1\right)\left(x-2\right)\:}=\frac{a}{x+1}+\frac{b}{x-2}$
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