$\lim_{-x\to-2}\left(x^5+x^3+x\right)$
$-8ab-7bc+9b+-10ab-bc+4b$
$\frac{dx}{dy}+xy=xy^2$
$a^2+3a-40$
$x^3\left(-2+\frac{7}{x}\right)$
$\frac{6x}{4x^2}$
$\frac{x}{x-1}+\frac{1}{x+1}-\frac{2}{x^2-1}$
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