$csc^2a-2$
$7q\:-\:15\:=\:9\:-\:5q$
$\frac{dy}{dx}=2e^{x-y}$
$x-20=4$
$-5+\left(-2+5\right)-\left(2+7-3\right)+18$
$\left(\:4x+2y\right)^2$
$1x+\:3y=20$
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