$\frac{x+1}{x+2}+\frac{x+1}{x+2}-\frac{x-2}{x+4}$
$9+6b^6+b^{12}$
$5-x+\frac{1}{5}$
$4+20b+25b^2$
$-8+5-9-2-8-8-5+5$
$20+4$
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