$4x^2z-2x^2z+7x-5x$
$27x^{15}-216y^{12}$
$\left(3x+8\right)\left(2x+1\right)$
$tan\left(x-y\right)=\frac{a-b}{a+b}\:$
$4^5$
$-4+8-3+9-2+7-1$
$\frac{2}{2x}$
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