$\int\left(81+x^2\right)^{-4}dx$
$\left(-62+3\right)-\left(54-8\right)$
$4x-2x+8x+10x-3x-x-7x-8x$
$\frac{dy}{dx}=7xz$
$\left(x+1\right)\left(x-1\right)-\left(x+1\right)\left(x-1\right)$
$9^{x-3}=729$
$-2\:+\:2\:-\:\left(-2\right)\:\cdot$
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