$\left(\sqrt{9x^2+3x}\:\right)^2\:-\:3x^2$
$\frac{\left(-2xy\right)^3}{x^3y}$
$3pq-2pr+4pq-3pr-pq$
$x^2-4x-8$
$\frac{1-x^2-x}{x}$
$\left(3x-20\right)^2$
$-4=32$
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