$\frac{d}{dx}16x^2+25y^2=400$
$\frac{3x}{3x^2-3}$
$x^3:x^3$
$\left(6-26\right)\left(4-4\right)$
$\int x^3e^{-4}dx$
$3x^2-4x=7$
$9m\:=\:-63$
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