$\left(-\frac{1}{3}a\right)\cdot15$
$x^2-3x-5x+6$
$\left(x^2y+2z\right)^2$
$\lim_{x\to2}\left(\frac{4}{x^2-4}\right)$
$\left(\frac{1}{-16}\right)^{-1}$
$n^{2}+6n$
$\left(-3x^3y\right)\left(xy\right)$
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