$\lim_{x\to3}\left(2x-22\right)$
$mn=7$
$\int\left(\text{tan x}+\text{cot x}\right)^2dx$
$4\left(x+1\right)+5=6\left(x-1\right)+x$
$\frac{1}{x^2}+\frac{-3}{x^2}+\frac{3}{x^2}$
$\frac{3}{4}z^2y^3+\frac{1}{2}z^2y^3+\frac{5}{3}z^2y^3$
$2x^{2\:}+x-7x-5x^2$
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