$\frac{125-343b^{15}}{5-7b^5}$
$\frac{1}{s}\frac{10}{s+5}\frac{1}{s+2}$
$\frac{x-3}{x^4-1}$
$\frac{x}{2}=16$
$2\sin^2a-5$
$1-c+4c-29$
$6\left(2x+1\right)+x\left(2x+1\right)$
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