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Consider the three planes $P_1: 3x + 15y + 21z = 9$, $P_2: x - 3y - z = 5$, and $P_3: 2x + 10y + 14z = 5$. Then, which one of the following is true?
(1) $P_1$ and $P_3$ are parallel.
(2) $P_2$ and $P_3$ are parallel.
(3) $P_1$ and $P_2$ are parallel.
(4) $P_1$, $P_2$ and $P_3$ all are parallel.
BETA
