$x^3y-y^2=-y^2$
$-9s+27$
$\left(-5x^{-3}\right)\left(7x^{\frac{2}{3}}\right)$
$-8+x=5$
$x^2-4x-\frac{4^2}{2}$
$\left(y+9\right)\left(y+4\right)$
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