$7\int\frac{x}{x^2+8}dx$
$-6n+n+3u$
$3x+4y-7z=172$
$y'=-\frac{2x\left(3y^2+2x^2\right)}{3y\left(y+2x^2\right)}$
$2x^212x-24$
$-2x^3+2x^2+18x-18$
$\lim_{x\to2}\left(\frac{x^3+3x^2-4}{\left(x+2\right)^2}\right)$
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