$\frac{5x}{2}\cdot\frac{4x}{10}$
$4x^2\:+\:8x\:-\:32\:=\:0$
$-13+-799$
$\int3\left(3x+2\right)^3dx$
$\left(x+2\right)\left(x^2-5x-3\right)$
$9^4-\:15\:x^2+1$
$4x+13=12x-3$
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