$\frac{d}{dx}\:6x^3y-2x^2=40$
$3.2+5.7$
$\left(6x-7y+8\right)\left(-y+6-4x\right)\left(9-3x+8y\right)$
$5x-7<27$
$\int_{-5}^5edx$
$-2m+2m$
$\left(-20\right)\:-\:\left[\left(+5\right)\:+\:\left(-6\right)\right]\::\:\left(-1\right)\:+\:\left(-3\right)$
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