$2\left(x-y\right)+\frac{4}{3}y=-5\left(y-x\right)+2$

$\frac{d}{dx}5^{8-9x}$

$\lim_{x\to\frac{\pi}{2}}\left(\left(sin\left(x\right)\right)^{\frac{2}{2x-\pi\:}}\right)$

$x-7=2x+1$

$17+19n-18-13n$

$\left(x-y\right)+\left(x+y\right)\cdot y'=0$

$\left(x-2\right)\left(x+1\right)+\left(x-2\right)\left(x+3\right)$