$4\left(x+2\right)-20\left(x-6\right)$

$25a^{4}b^{2}-30a^{2}bc^{3}+9c^{6}$

$\lim_{x\to-4}\left(\frac{x^2+7x+12}{x+4}\right)$

$2a+3=a+5$

$\left(\frac{x^{-\frac{2}{3}}}{y^{\frac{1}{2}}}\right)\left(\frac{x^{-2}}{y^{-3}}\right)^{\frac{1}{6}}$

$\int_0^8\left(150e^{-0.3x}\right)dx$

$3x^2-28x+25=8x^2-43x+43$