$\left(q-\frac{1}{2}p\right)\left(q+\frac{1}{2}p\right)$
$2ab-30$
$3x^2-36x+60$
$x2-9x-20$
$-2+x=12$
$\lim_{x\to3}\left(\frac{x^2-6x+9}{x^2-x-6}\right)$
$m^3=8$
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