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