$4c+5c$

$1-x-x^2$

$\left(\frac{x^2}{x+6}\right)+\left(\frac{4x}{\left(x-6\right)\left(x+6\right)}\right)$

$\left(-3\right)\cdot\left(26+92\right)-\left(-8\right)\cdot\left(-3\right)$

$\int x^2\cdot\sqrt[5]{x^2}+2dx$

$\left(w^3+y\right)\left(w^3-y\right)$

$\frac{-5x^3-20x^2-15x-10}{x+3}$