$\frac{\left(2x^2y^{-3}\right)}{\left(x^2y^{-1}\right)^{-2}}$
$\:\int\left(\frac{1}{36+4x^2}\right)dx$
$4x^2-4x+7$
$4\left(-5w-8\right)-4w$
$\left(a^7\right)^2$
$15\cdot30$
$16x^2-28x-30$
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