$\frac{\left(-4-x^2\right)}{\left(x+2\right)}$
$4x+2=3x+15$
$\left(x^2-0\right)$
$\frac{3x-9}{2x+8}$
$\sqrt{80ab^2}$
$-y=\cos^3\left(2x^4\right)$
$\left\{\left\{3+2-\left(9-7\right)+\left(3+4\right)\right\}\right\}2$
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