$27v^3+64$
$\left(3x+2\right)-1.\left(3x+9\right)$
$12m+20mx+40my$
$\lim_{x\to a}\left(\frac{e^x-e^a}{x-a}\right)$
$x^4+x^2-20$
$8^3\:.\:8^2\:.\:8^{-7}$
$\left(15-2x\right)\left(20-2x\right)x$
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