$2x\:+\:4\:=-8$

$-\sqrt{0.125}$

$\frac{d}{dx}\frac{2^x}{x}$

$\int8xe^{-3x}dx$

$\left(7+\tan\left(x\right)\right)\left(7-\tan\left(x\right)\right)+\sec^2\left(x\right)$

$\frac{y}{xz\left(x+y\right)}+\frac{z}{xy\left(y+z\right)}+\frac{x}{yz\left(x+z\right)}$

$\left(\frac{y}{y^4}\right)^2$