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m in (-oo:+oo)
(1/6)*m-7 = 2/3 // - 2/3
(1/6)*m-(2/3)-7 = 0
(1/6)*m-2/3-7 = 0
1/6*m-23/3 = 0 // + 23/3
1/6*m = 23/3 // : 1/6
m = 23/3/1/6
m = 46
m = 46
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