$\lim_{x\to-2}\left(3x^3-2x^2-5x+6\right)$
$\:2k+2+k+3+2k$
$\frac{1}{3x+1}+\frac{1}{2x+2}+\frac{1}{x^2-1}$
$y'\:=\:3y\:+\:4$
$\int\frac{2x^2}{\left(x^2+3\right)^2}dx$
$\left(-903\right)-2000$
$x^2=-9x+15$
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