$4x+3y-y+9+2x-4$

$y^2-25w^2$

$\lim_{x\to\infty}\left(\frac{\ln\left(x\right)}{\frac{x}{log\left(x\right)}}\right)$

$\left(8-5x\right)^2$

$2xy^3+1\left(3x^2y^2-y^{-1}\right)y'=0$

$4\sin\left(x\right)\cos\left(x\right)=\cos\left(x\right)$

$\frac{\left(\frac{1}{7}x^8y^8z^8\right)}{\left(\frac{1}{2}x^2y^3z^4\right)}$