$x^3-19x-30$
$r^2+10r-25$
$-9\:+\:4q\:=\:-9q\:+\:4$
$\frac{1}{4}\left(8x\:+\:20y-\frac{3}{4}\right)$
$\left(2+y\right)\left(2+y^2\right)$
$x2\:+\:6x\:+\:12$
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