已知\(\frac{a}{6} = \frac{b}{5} = \frac{c}{4} \ne 0\)，且\(a + b

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已知\(\frac{a}{6} = \frac{b}{5} = \frac{c}{4} \ne 0\)，且\(a + b - 2c = 3\)，求\(a\)的值．

参考答案：6