$4\left(x\:+\:1\right)\:+\:2\left(x\:-\:1\right)\:=\:7\left(x\:-\:3\right)$

$\int\frac{\left(1+\ln\left(x\right)\right)}{x^3}dx$

$2.5\cdot2.4$

$4x+\frac{-8}{x}+2$

$\left(u^{-2}+u^{-3}\right)\left(u^5-9u^2\right)$

$\frac{\frac{x^2}{x^2+17x+70}}{\frac{x^4}{x+10}}$

$40\:-16+12+60-15$