$3f^2-108a$
$-3y^2+2x+2+3x$
$\left(9k+3\right)\left(9k+3\right)$
$x^2\:\ge6\:-\:x$
$n^2-32n+256$
$3e+7-e\:2e+10+2e-3$
$tan\left(\frac{1}{2}+\left(-6\right)\right)$
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