$12+-20\cdot\frac{40}{4}$

$16x^2+48xy^2+36$

$\left(12.5\right)-\left(-25\right)$

$\int\frac{\left(2x^2+1\right)}{\left(\left(x^2+2\right)\left(x-4\right)\right)}dx$

$\left(\frac{\left(x^2yz^3\right)^4\left(xy^3z^5\right)^4}{xy^3z^5}\right)^2$

$\left(-4p\:+\:8\right)\left(-5\right)$

$\int_0^{\infty}\left(e^{\left(\frac{x}{3}\right)}\right)dx$