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m in (-oo:+oo)
(5/6)*m-(5/12) = (7/8)*m+2/3 // - (7/8)*m+2/3
(5/6)*m-((7/8)*m)-(5/12)-(2/3) = 0
(5/6)*m+(-7/8)*m-5/12-2/3 = 0
-1/24*m-13/12 = 0 // + 13/12
-1/24*m = 13/12 // : -1/24
m = 13/12/(-1/24)
m = -26
m = -26
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