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m in (-oo:+oo)
(2/7)*m-(1/7) = 3/4 // - 3/4
(2/7)*m-(1/7)-(3/4) = 0
(2/7)*m-1/7-3/4 = 0
2/7*m-25/28 = 0 // + 25/28
2/7*m = 25/28 // : 2/7
m = 25/28/2/7
m = 25/8
m = 25/8
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