$\left(\frac{a^{-4}b^2}{ba^2\cdot a^2b^{-4}}\right)^3$

$\lim_{x\to7}\left(\frac{2x^2-10x-28}{3x^2+16x-35}\right)$

$2x^2-200$

$\frac{d}{dx}\:3x^2-4x+5$

$\left(x^3+6x^2+9\right)\frac{3}{5}$

$\frac{\left(3y^2-t^2\right)}{y^5}\frac{dy}{dt}+\frac{t}{2y^4}=0\:$

$x+2=2x-2$