$\left(6-20\right)+350$
$\frac{d}{dx}5xe^{3x}$
$\left(6a^2+b\right)\left(6a^2-b^2\right)$
$7+2b+7b+2$
$49x^2-70x$
$-3x+8\ge14$
$4x^{a-2}-2x^{a-1}+x^a\:por\:x^2+2x-1$
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