$5x^2+7x-45$
$3-\left(-4\right)+5\left(2-\left(4-\left(-7\right)+10\right)\right)$
$3\left(2-6+3\right)$
$\frac{\left(x^2+4x-14\right)}{x+6}$
$-2x^2-4x-5$
$0.09n^2-0.25m^2$
$ax^2+10ax+16a$
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