$\frac{4}{x}-\frac{x}{2}=\frac{12}{x}$
$2x^2ex$
$\left(9\right)-\left(-3\right)$
$0.02-0.2$
$135+22$
$\lim_{x\to\infty}\left(x^{-2}\right)\left(e^{2x}\right)$
$\frac{\sqrt{1+3}-2}{1-1}$
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