$6\sqrt{-81}+3\sqrt{-49}$
$-17n-12=-14n$
$3xy+2+\sqrt{24xy}$
$x^3+15x^2+125+75x$
$2x^2-7x-9=0$
$\frac{4x-24}{x^2-36}$
$\frac{\sin\left(x\right)}{1-\cos\left(x\right)}\cdot\cot\left(x\right)$
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