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m in (-oo:+oo)
(5/7)*m = 4/6 // - 4/6
(5/7)*m-(4/6) = 0
(5/7)*m-2/3 = 0
5/7*m-2/3 = 0 // + 2/3
5/7*m = 2/3 // : 5/7
m = 2/3/5/7
m = 14/15
m = 14/15
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