$5\left(k+2\right)$
$9x^2-36xy-36y^2$
$\sqrt{4x^2}-9$
$7pq^3+48p^3q^2+5p^3q^2$
$6w^2+w-21$
$2u^3-w^4-32u^3$
$b\left(1+x\right)+x^{2}+1$
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