$\frac{x^3+5x}{\left(2x-1\right)^2\left(x^2+3\right)}$
$\frac { 5 } { x } | x$
$\left(a^2+1\right)^9-\left(b-1\right)^9$
$-\frac{10}{16}m^2n+\frac{9}{5}m^2n$
$3\cdot1$
$81-64b^{10}$
$\int\frac{3}{\sqrt{x^{2}+49}}dx$
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