$156x-12x$
$y^2-8xy$
$\left(4z^3w\right)^2$
$\left(5y^2-\frac{2}{3}y\right)^2$
$7x^3y^2+11x^3y^2$
$\frac{\cos\left(x\right)-5}{\cos^2\left(x\right)-25}$
$5x+9-\left(6x-7\right)$
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