$\frac{2x^2+5x-18}{x+4}$
$81x^2-121y^2$
$-8+3-7+5$
$\int\frac{x^5}{\sqrt{x^3}+3}dx$
$36w^2-12w+1$
$\sqrt{16x^{10}.y^8}$
$7s-2s-s$
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