$\left(x^2+6x-1\right)\left(2x^2+9x+5\right)$

$\int\:x^2\left(x-\frac{2}{x}\right)dx$

$\left(7\right)x\left(-2\right)x\left(4\right)$

$\left(1\:+\:m^3\right)\:\left(1+m\right)$

$\frac{x}{x+1}+\frac{x}{x-2}=\:1$

$-2x+12x+40$

$9\left(x+2\right)^2-169\left(x-y\right)^2\:$