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m in (-oo:+oo)
(2/9)*m-(5/6) = 7/12 // - 7/12
(2/9)*m-(5/6)-(7/12) = 0
(2/9)*m-5/6-7/12 = 0
2/9*m-17/12 = 0 // + 17/12
2/9*m = 17/12 // : 2/9
m = 17/12/2/9
m = 51/8
m = 51/8
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