$\int x^2e^{-3x}dx$
$\int\:\frac{1}{u+2u^2-1}du$
$\left(w-2x\right)^2$
$-3+\left(\left(\left(-8\right)-\left(-5\right)\right)+12\right)$
$3r-12s-5+r+9s+2$
$7x+9y=-42$
$\left(-1^2\right)^3$
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