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m in (-oo:+oo)
2*m-(5/6) = 7 // - 7
2*m-(5/6)-7 = 0
2*m-5/6-7 = 0
2*m-47/6 = 0 // + 47/6
2*m = 47/6 // : 2
m = 47/6/2
m = 47/12
m = 47/12
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