$\frac{20}{4x}+\frac{3x^2}{4x}$
$-2x-4+5x+8$
$\frac{2f^2}{-2f^2}$
$\int\frac{1}{x-1\left(x+1\right)}dx$
$32=-4a+36$
$\lim_{x\to0}\left(\frac{ln\left(x\right)}{ln\left(2e^x-2\right)}\right)$
$\frac{70}{10}$
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