$\left(3x+6\right)x\left(3x-6\right)$
$\left(289\right)+\left(-250\right)-\left(-160\right)-\left(-280\right)-\left(-300\right)-\left(-120\right)$
$\frac{d}{dx}13^x$
$5x-11y-9+9+20x-1-y$
$4\left(6-y\right)$
$\lim_{t\to x}\frac{5}{x-7}$
$\left(1-x\right)dy=2\left(1+y\right)dx$
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