$-12+3+45+99-2$
$2^2-1$
$\frac{\left(3x^4+9x^2+x-5\right)}{\left(x+2\right)}$
$111ab\:-\:162ab$
$\lim_{x\to\infty}\left(\frac{7x^2+9x}{6x^3+x+8}\right)$
$4x+22$
$\left(30n^7-1\right)\left(30n^7+1\right)$
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