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m in (-oo:+oo)
(2/3)*m-(1/3) = 5/6 // - 5/6
(2/3)*m-(1/3)-(5/6) = 0
(2/3)*m-1/3-5/6 = 0
2/3*m-7/6 = 0 // + 7/6
2/3*m = 7/6 // : 2/3
m = 7/6/2/3
m = 7/4
m = 7/4
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