$\frac{\left(a+4\right)\cdot\left(\sqrt{a-4}\right)}{\left(\sqrt{a+4}\right)\cdot\left(\sqrt{a-4}\right)}$
$\frac{dq}{dt}=-4q+12$
$\frac{2x^{-5}y^2}{x^3y^4}$
$\left[-15+\left(-7\right)\right]\left(-8-11\right)$
$x^{\left[2\right]}\cdot\left(x+1\right)\cdot\left(x+2\right)$
$2y\:+\:7\left(8\:-\:4y\right)$
$2a+3b-7=15$
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