$5x+5;\:x=2$
$7b^2\left(3+9b\right)$
$4x+5x+6$
$-n+8n$
$-x^3-9x^2-27x-27$
$\frac{b^7+1}{b-1}$
$\left(8-2a\right)\left(6-2a\right)\left(x\right)$
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