$\:-13\:\cdot\:x\:=\:-52$
$-\left(-30-\left(-2\right)\right)$
$\int_{\frac{\pi}{2}}^{\frac{3\pi}{2}}senxdx$
$x^2+2x^2+10^2$
$16m^2-20m+25$
$\frac{14x^2}{x^8}$
$e^{-x}+e^{-x}2+e^{2x}+2e^{2x}3$
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