$\lim_{x\to-\infty}\left(\frac{e^{-x}}{x^2}\right)$
$\int-12x^3\left(-3x^4-1\right)^5dx$
$\left(\frac{1}{2}a+\frac{2}{3}b\right)^3$
$100r^2-160r+64$
$2\left(y+4\right)+10\left(y-3\right)+4$
$15-\left(-27\right)$
$a+b+b-a$
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