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m in (-oo:+oo)
(5/7)*m-(1/2) = 2/3 // - 2/3
(5/7)*m-(1/2)-(2/3) = 0
(5/7)*m-1/2-2/3 = 0
5/7*m-7/6 = 0 // + 7/6
5/7*m = 7/6 // : 5/7
m = 7/6/5/7
m = 49/30
m = 49/30
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