$30-2\cdot10+5\cdot2$
$3\cdot b=-6$
$\left(6\right)\left(-5\right)-3-5+2$
$\frac{d}{dx}\left(xy\sin\left(xy\right)\:=\:xy\cos\left(xy\right)\:+2x\right)$
$7a-3a^2+2a^2$
$\frac{x^2-4}{x-1}$
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