$-7x^2-8$
$\left(5d-5\right)^3$
$n+n$
$-7x^2+12x+36$
$\lim_{x\to2}\left(\frac{3x^2+4x-1}{x^2-x-2}\right)$
$\frac{2x^2-2x-4}{x^2+4x+3}$
$\left(3m^{a+2}n^{a-1}+4^{a-2}\right)^2$
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