$-985-\left(-159\right)$
$4x-4-2x+3$
$\left(\frac{a}{4}\:-\:2b\right)\left(\frac{a}{4}\:-\:6b\right)$
$x^3+x^3+x^3$
$\int2e^{3x^2}xdx$
$\lim_{x\to-1}\frac{x^2-1}{x^2+2x+1}$
$\int e^x\left(x+3\right)^2dx$
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