$\frac{13\left(x-8\right)^n}{n^2+2n}$
$x9\:\cdot\:x-7$
$\left(15\right)\left(4\right)\left(-1\right)$
$y=\left(15x^{4}+34x^{3}+43x^{2}+62x\right)^{15}$
$log20\:\left(x\:+\:2\right)\:+\:log20\:\left(x\:-\:6\right)\:=\:1\:\:$
$\:\left(x-6\right)\:\left(x+18\right)$
$e^{-2y}dy=e^{3y}dx$
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