$11abc-8bc+10abc-10bc$

$\frac{dy}{dx}=5\:-\:\frac{y}{1000\:-\:5x}$

$\frac{d}{dx}\left(sin\left(x^7\right)y=3x-y\right)$

$\frac{\sin\left(x\right)}{\cos\left(x\right)}+\frac{\cos\left(x\right)}{\sin\left(x\right)}=1+\cot\left(x\right)$

$\left|17\right|+\left|-9\right|$

$-x^3-3x^2-17x-8$