$-12+\left(-200\right)+\left(-1500\right)$
$\lim_{x\to-1}\left(\frac{x^4+4x^3+4x+7}{x+1}\right)$
$y=3x^2+4x+2$
$8 x ^ { 3 } + 4 x ^ { 2 } + 2 x - 4$
$8m^3\left(a^2-b^2\right)+24m^2\left(a^2-b^2\right)$
$\frac{dy}{dx}=\frac{\left(5x-y\right)}{\left(x+6y\right)}$
$9x^2-42x\:-21$
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