$7z+11z-2z$

$\lim_{x\to1}\left(\frac{x\ln\left(x\right)}{3x^2-2}\right)$

$x\left(\frac{dy}{dx}\right)=y^2-9y$

$14-\frac{24}{3+\frac{6}{2}}$

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

$125+216u^3$

$\frac{x}{\left(x-2\right)}+\frac{x+2}{x}=2$