$$x(y+1)+2(y+1)+9(y+1)$$
$\left(x+11\right)\left(y+1\right)$
$$xy+x+2\left(y+1\right)+9\left(y+1\right)$$
$$xy+x+2y+2+9\left(y+1\right)$$
$$xy+x+2y+2+9y+9$$
$$xy+x+11y+2+9$$
$$xy+x+11y+11$$
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$xy+x+11y+11$