$\left(m-12\right)\left(m+7\right)$
$\frac{\left(x+2\right)}{\left(x+7\right)\left(x-9\right)}$
$7x^2-14x^2+x^2$
$\sqrt{2500}$
$\sqrt{\left(7.5\right)^2\:+\left(-9\right)^2\:}$
$18x^2=65x-7$
$-3\left(-5+7\right)$
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