$\int_0^1\left(\left(\frac{\left(x^2-1\right)}{x^2\left(x-5\right)}\right)\right)dx$

$8m+16n$

$\int e^xsin\left(2+e^x\right)dx$

$\left(x-20\right)\left(x+15\right)$

$3^1\cdot\sqrt{841}+\left(-7\right)^2+\left(-5\right)^3$

$\left(2-2\right):\left(2-3\right)$

$4x+5x+6x$