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m in (-oo:+oo)
(2/7)*m+5/9 = 67/126 // - 67/126
(2/7)*m+5/9-(67/126) = 0
(2/7)*m+5/9-67/126 = 0
2/7*m+1/42 = 0 // - 1/42
2/7*m = -1/42 // : 2/7
m = -1/42/2/7
m = -1/12
m = -1/12
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