$\frac{\left(2\right)+\left(-2\right)\cdot\left(-2\right)}{-2}$
$puto+puto$
$\left(\frac{2}{5}a+\frac{3}{5}\right)^2$
$\sqrt{16}x\:\sqrt[3]{1}$
$\frac{2x^{-2}}{2x^3}$
$2.3\cdot10^3$
$\lim_{x\to3}\left(\frac{x^2-2x-3}{4x+12}\right)$
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