$\left(15-x\right)^2$

$\frac{d}{dx}\left(x^3\tanh\left(y\right)=y-16\right)$

$\frac{3t^2}{\sqrt[5]{t^2}}-\frac{7t^{-1}}{\sqrt{t^3}}+8\sqrt[7]{t^3}+4t^{-3}-6$

$\left(-7\right)\cdot\left(-4\right):\left(+2\right)$

$121m^2+44+4$

$3=\frac{a\left(-2\right)+b}{\left(-2\right)+c}$

$5\:+\:2\:-\:9\:-\:1\:+\:11$