$15-3a=-9$
$2x^2-3x\:+\:8$
$\left(2d-1\right)\left(2d+1\right)$
$\frac{3}{\csc x-1}-\frac{3}{\csc x+1}=6tan^2x$
$4\left(-p-6\right)$
$2\pi rh+2\pi r^2$
$\:-4x\:+\:2\:-\:2x$
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