$x\:\frac{dy}{dx\:}-2y=x\ln\left(3x\right)$
$\left(7+x\right)\left(7-4x\right)$
$y\:+\:y'\:=\:e^x\:cosx$
$12a+8a+4a-15a-9a$
$9z^2+48z+64$
$7 - ( x ^ { 3 } ) ^ { 2 }$
$\lim_{x\to2}\left(\frac{\sin\left(\pi w\right)}{w^2-16}\right)$
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