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m in (-oo:+oo)
(6/7)*m-(1/7) = 3/70 // - 3/70
(6/7)*m-(1/7)-(3/70) = 0
(6/7)*m-1/7-3/70 = 0
6/7*m-13/70 = 0 // + 13/70
6/7*m = 13/70 // : 6/7
m = 13/70/6/7
m = 13/60
m = 13/60
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