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m in (-oo:+oo)
-31/72 = 7*m-6*m-(7/8) // - 7*m-6*m-(7/8)
7/8-(-6*m)-(7*m)-31/72 = 0
6*m-7*m-31/72+7/8 = 0
4/9-m = 0 // - 4/9
-m = -4/9 // * -1
m = 4/9
m = 4/9
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