$\frac{d}{dx}\left(y^2=\frac{x+2}{x-4}\right)$
$x^2+82x$
$3^2+3^{-2}$
$-m^{30}-144$
$3+7x-\left(2+9x\right)$
$18x+11x$
$-1a+9a$
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