$15x^2-9x$
$21y-28$
$-13+\frac{-5-7-9}{-7}+\frac{-12}{4}$
$f\left(x\right)=\frac{x^2-6x}{1+\cos\left(x\right)}$
$3x-11+-x-7$
$2y-6x+9-3y-10$
$\left(2a-2b\right)\left(a-3b\right)$
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