$18^{14}$
$-8m^4n+4mn^2+7.2mn$
$\left(12+7x\right).\left(12-7x\right)$
$9m-7+2$
$2x^2-24x+72$
$\left(x+3\right)^2-5\left(x+2\right)\left(x-2\right)$
$y-1+y+y+2\left(y-1\right)+y-1+2+0+0$
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