$2m-3n-\left|-3n+2n\right|$
$\frac{dy}{dx}=4x^3y^2$
$\left(x-\frac{3}{4}\right)\left(x+\frac{5}{6}\right)$
$\frac{a^7+128}{a+2}$
$15x^2-30=0$
$-13m\:+\:5n\:-\:8p\:-\:7p\:-\:8m\:+\:3n\:$
$-343^7$
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