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Let $a, b \in R$. If the mirror image of the point $P(a, 6, 9)$ with respect to the line $\frac{x - 3}{7} = \frac{y - 2}{5} = \frac{z - 1}{-9}$ is $(20, b, -a - 9)$, then $|a + b|$ is equal to:
(1) $86$
(2) $88$
(3) $84$
(4) $90$
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