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