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m in (-oo:+oo)
(5/7)*m-(1/7) = 3/28 // - 3/28
(5/7)*m-(1/7)-(3/28) = 0
(5/7)*m-1/7-3/28 = 0
5/7*m-1/4 = 0 // + 1/4
5/7*m = 1/4 // : 5/7
m = 1/4/5/7
m = 7/20
m = 7/20
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