$\lim_{x\to0}\left(\frac{1}{3}\right)^{x-2}-4$
$2\left(k+1\right)$
$\left(2w^4+5z^3\right)^2$
$\left(t^3\right)^3$
$-20x+18y$
$\frac{x+2}{x-2}.\frac{x+2}{x+2}$
$10x\:+\:3x\:-\:6x$
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