$3x^2+12x-14=0$
$x+2\cdot x+2$
$9\cdot z=18$
$bm+2bn+a\left(m+2n\right)$
$x^{2\:}+12x=18$
$15\tan^2a+14\tan a-8$
$x^4+7x^3-x^2-67x-60$
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