$3x\:+\:2y\:+\:z\:=\:7\:$
$\frac{3x^2y-8x}{x+2}$
$\left(4x^2y^2z\right)\left(-2x^3y^4z^2\right)$
$\lim_{x\to-\infty}\left(\frac{x^2+2}{x^2+2x+1}\right)$
$\frac{x^6-b^6}{x-b}$
$\:3xy\left(2xy-3y\right)$
$\int_1^{\infty}\left(\frac{1}{3x^2-1}\right)dx$
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