$12\cdot14$
$m^2+7-4m^2$
$v^2+12v+36$
$\int\left(\frac{x+2}{x^2}\right)dx$
$y'=9.81-2\cdot y^2$
$\left(x^2-4x-12\right)\left(12-4x-x^2\right)$
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