$7+13+-6+1$
$2x-5y+2y-3x$
$5\left(5w+7\right)$
$\left|-7-\left(-3\right)\right|$
$c=\frac{a^3+b^3}{a^2+b^2}$
$\frac{2}{3}x\:cm^2+\frac{2}{3}x\:cm^2+\frac{2}{3}x\:cm^2+2x\:cm^2$
$x^2y^3-3x^2y$
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