$9\left(4c+2\right)+7c$
$-6x^2+4x+2x+7x^2-x^2$
$x-19=-14$
$14x\:x\:8$
$\sqrt{256.121}$
$\left(\frac{1}{4}m+n\right)\left(-\frac{1}{4}m+n\right)$
$\int\left(\frac{1}{\left(x-2\right)^2+4}\right)dx$
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