3m-2n=7 3m-n=5
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3m-2n=7 3m-n=5
3m-2n=7 3m-n=5
3m-2n=7 3m-n=5
3m-2n=7 (1)
3m-n=5 (2)
(2)-(1)
n=-2 带入 (2)
m=1
n=2 M=2/3
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