$15x^8\:+\:20x^6\:$
$\log_{1-x}\left(3\right)=1$
$1dy-xdy-ydx=0$
$-2u^2+u$
$m-3=-21$
$81a^2b^4+54a^6b^3+9a^4b^2$
$\lim_{x\to-\infty}\left(\left(\sqrt{2x^2+3x}-\sqrt{2x^2-5}\right)\right)$
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