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m in (-oo:+oo)
(4/7)*m-(1/7) = 3/42 // - 3/42
(4/7)*m-(1/7)-(3/42) = 0
(4/7)*m-1/7-1/14 = 0
4/7*m-3/14 = 0 // + 3/14
4/7*m = 3/14 // : 4/7
m = 3/14/4/7
m = 3/8
m = 3/8
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