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m in (-oo:+oo)
(2/7)*m-(1/7) = 14 // - 14
(2/7)*m-(1/7)-14 = 0
(2/7)*m-1/7-14 = 0
2/7*m-99/7 = 0 // + 99/7
2/7*m = 99/7 // : 2/7
m = 99/7/2/7
m = 99/2
m = 99/2
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