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m in (-oo:+oo)
3-m-m = 9/7 // - 9/7
3-m-m-(9/7) = 0
3-m-m-9/7 = 0
12/7-2*m = 0 // - 12/7
-2*m = -12/7 // : -2
m = -12/7/(-2)
m = 6/7
m = 6/7
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