$\left(2x+3\right)\left(7+2x\right)$
$\frac{2x^2-3}{x^2+1}$
$2x-y+z=2$
$-4x^2+x-14=0$
$4\left(4y+2\right)-10$
$\frac{dy}{dx}=8x^8y^{-7}$
$9\csc^2x=1$
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