$-4-5+1-1$
$64x^6-81y^6$
$\lim_{x\to\infty}\left(\frac{xe^{-\left|x\right|}}{\left|x\right|}\right)$
$-5\left(1-5x\right)+5\left(-8x-2\right)=-4x-8x$
$\left(4y-2\right)^2$
$\frac{dq}{dx}=1-\frac{1}{100}q$
$x^2=13$
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