$\frac{32-6}{2}$

$\frac{\left(-27+4-61\right)}{7}$

$e^{-x^2}\frac{dy}{dx}-2e^{-x^2}xy=\sin\left(x\right)$

$\left(5a+11\right)\left(5a-13\right)$

$\frac{t^4+t^2+1}{\left(t^2+1\right)\left(t^2+4\right)}$

$5x-3x-7$

$\lim_{n\to1}\left(\frac{\ln\left(n+1\right)}{n}\right)$