$60-3h-9$
$\frac{2\left(3x-1\right)}{3}-\frac{5}{6}=\frac{x}{2}$
$3+6x=21$
$-290+-300$
$z\:=\:e^{x+2y}$
$100x^2-4y^2^2$
$tan^2\:-\:sec^2\theta\:\:=-1$
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