$3a\left(a+4\right)-2a+7$
$mx^2-3x-2=\left(mx+1\right)\left(x-2\right)$
$12x^2\:-\:8xy\:-\:15y^2$
$\frac{1}{x+1}-\frac{1}{x+2}=\frac{1}{6}$
$\left(y-5\right)^2=cx$
$\frac{-9+3}{\sqrt{x}-3}$
$\left(z+1\right)\left(3z-1\right)$
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