$x+86=47$
$\frac{1}{x^2-xy}-\frac{1}{x}-\frac{1}{x-y}$
$y'=y-2$
$4x^2-42x+57$
$\log_a\left(u^2v^9\right)$
$\left(y^{-1}+y^{-2}\right)\left(2y^{-3}-3y^{-4}\right)$
$-m+2m$
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