$\int e^{-18x}dx$
$3\left(x-y\right)+b\left(x-y\right)$
$\frac{dy}{dx}-2y=2x-5$
$400a^2\:-\:256b^2$
$\sin\left(2x\right)+2\cos\left(x\right)$
$3\left(-4-7\right)$
$3x+xy+6;\:x=4;\:y=2$
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