$z^2+z+1$
$\left(3c-2c\right)-c+c$
$\frac{1}{x+1}+\frac{1}{x-1}=\frac{2}{x^2-1}$
$\lim_{t\to\infty}\:\frac{3700t}{t+5}$
$21x^2+19x-2$
$\left|-5\right|-\left|-2\right|$
$m-8m+2m-6$
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