$\frac{27z^3}{3z}$
$\int\left(\frac{1}{2}x^2+1\right)\frac{1}{2}x\:dx$
$20-\left(-77\right)$
$-2x-2x-2x-2$
$9z^2-3z+1$
$2b\sin^2x=1$
$2x^5y^2+4x^2y^3+xy^4$
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