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