$-8\left(r+4\right)+7\left(r+2\right)$
$\frac{x+6}{3}-\frac{x+8}{5}=0$
$40^3$
$5x^3y^4\left(3x^2y^2\:-\:7x^5y\right)$
$\sec^230-\tan^245$
$\frac{\left(6v^2\right)^{-1}w^{-4}}{\left(2v\right)^{-3}w^{10}}$
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