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If the system of equations $x + y + z = 2$, $2x + 4y - z = 6$, $3x + 2y + \lambda z = \mu$ has infinitely many solutions, then:
(1) $\lambda + 2\mu = 14$
(2) $2\lambda - \mu = 5$
(3) $\lambda - 2\mu = -5$
(4) $2\lambda + \mu = 14$
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