$5\left(a\:+\:b\right)-y\left(a-b\right)$
$\left(2x^2+6x\right)-\left(-3x^2+4x\right)$
$\frac{dy}{dx}=\frac{1}{4}\left(7-y\right)$
$984+-685$
$mercury$
$\frac{x^2\left(12x-4\right)}{4x+5}=0$
$2x+41=127$
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