$6=-3\left(x+2\right)$

$x^3+2x^2-29x+42$

$\frac{1}{2\:}x^2-7x=18$

$\frac{dy}{dx}+2xy^2=0\:\:y\left(1\right)=-1$

$\frac{\cos\left(a\right)-\sin\left(a\right)}{\cos\left(a\right)+\sin\left(a\right)}$

$\frac{dy}{dx}\left(x^be^x=y^ae^y\right)$

$\int\left(\frac{10}{9^x}\right)dx$