$-\frac{8s^{-2}}{2s^{-3}}$
$\sqrt[3]{\frac{x^3y^4}{z^2}}$
$4r+r$
$6b-2a$
$12-\left(-4\right)$
$0.4\left(4x-1mn\right)$
$\frac{3+\sqrt{10}\cos\left(x\right)}{\sqrt{10}\sin\left(x\right)+1}=0$
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