$2+\left(-2\right)-\left(13-4\right)+9$
$\left(2x^2+\frac{2}{y}\right)\left(2x^2-\frac{2}{y}\right)$
$\frac{2\sqrt{5}}{5\sqrt{2}}x\:\frac{-\sqrt{2}}{\sqrt{5}}x\:\frac{4}{3}x\frac{1}{2}$
$87\:-\:\left(-12\right)\:-\:\left(-19\right)\:+\:67$
$3a^2+a$
$4xy-16z$
$\frac{dy}{e^x}=xdx$
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