$28\:+\:12x\:-\:10\:-\:13x\:+\:y\:-\:x\:-\:2y\:+\:y$

$\left(n-7\right)\left(n-8\right)$

$3a\left(5a^2+8a+2\right)$

$\left(x^2+5\right)^3\left(x^2+4\right)$

$\sin\left(2x\right)-\tan\left(x\right)=-\tan\left(x\right)\cos\left(x\right)$

$\log_{11}\left(n+8\right)-10=-10$

$\frac{dy}{dx}=e^xy+e^x$