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m in (-oo:+oo)
(3/5)*m-(1/2) = 4/7 // - 4/7
(3/5)*m-(1/2)-(4/7) = 0
(3/5)*m-1/2-4/7 = 0
3/5*m-15/14 = 0 // + 15/14
3/5*m = 15/14 // : 3/5
m = 15/14/3/5
m = 25/14
m = 25/14
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