$2x^2-13x-21$
$\left(a^2-5\right)^2$
$\left(6z\:-\:3\right)^3$
$\frac{dx}{dt}=x\sin\left(t\right)$
$\left(-15b+16c-18d\right)+\left(-32b-40c-50d\right)+\left(-a+c-d\right)$
$\left(\frac{1}{4}z^5+\frac{1}{9}w\right)^4$
$-3\left(-99\right)$
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