$\frac{dy}{dx}-\frac{y}{2}+2=0$

$\text{left}\left(t+7\text{right}\right)\text{left}\left(t+7\text{right}\right)\text{left}\left(t+2\text{right}\right)$

$x^4-10x^2+169$

$x-4\left(3x^4-5x^3+7x^2-2x+13\right)$

$\frac{3x^3+6x^2-x+2}{x+1}$

$3x+12x-25x-52x$

$\lim_{x\to\infty}\left(120-80e^{-0.3x}\right)$