$2dx=\frac{x}{y}dy$

$7x^2-16x-4$

$\frac{49\:x^2\:y^6-z^8}{7\:x\:y^3-z^4}$

$\frac{5}{7}5x^2y-\frac{6}{14}x^2y$

$-6+c-6+a-c-c+36$

$\lim_{x\to\infty}\left(\frac{x^2-\frac{1}{x}}{x^3+sin\left(x\right)}\right)$

$\log\left(x\right)+\log\left(y\right)=\frac{1}{2}\log\left(9y^2\right)$