$\frac{n}{3^{n+1}}x^n$
$-2x^3+2x^2+18x-18$
$\left(a-bx\right)n$
$\int\left(\frac{x^5}{1-x}\right)dx$
$\frac{a^2b}{5}+\frac{2ab^2}{3}+\frac{3ab^2}{2}-\frac{5a^2b}{5}$
$-10x-17x$
$\left(18\:\cdot2000\right)\:+\:\left(24\:\cdot2125\right)$
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