$7+6r+r-5$
$64m^3-n^3$
$v^2+20v=-7$
$3x^2+6x+6$
$\left(9br^4\right)^3$
$\frac{dy}{dx}=4x-xy$
$\lim_{x\to0}\left(\frac{2sin\left(10x\right)}{5x}\right)$
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