$12\left(7x-2\right)-7\left(10x+5\right)$

$\left(-\:2500\right)\:-\:\left(\:-\:600\right)$

$\frac{dy}{dx}=1+x^2+y^2+y^2x^2$

$\lim_{x\to2}\left(\frac{\sqrt{8x}-4}{x-2}\right)$

$\frac{dx}{dy}=\frac{\left(y-1\right)\left(y+3\right)}{y^2\sinh\left(x\right)}$

$\lim_{x\to0}\left(\frac{\ln\left(x\right)^3}{x^2-1}\right)$

$\frac{x}{2}-\frac{1}{3}\le\frac{1}{2}+\frac{2x}{3}$