$\frac{dy}{dx}=\frac{-x^2y}{lny}$
$-\frac{9}{2}b+5a+ab+3c-\frac{6}{3}b-\frac{5}{4}a$
$4x\cdot\frac{2x}{3}$
$2\:\left(x\:+\:2y\right)\:dx\:+\:\left(y-x\right)\:dy$
$5-7\cdot8-2$
$\left(13a^4\right).\left(-5b^4\right)$
$\left(x-5\sqrt{3}\right)\left(x+5\sqrt{3}\right)$
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