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m in (-oo:+oo)
8-((5/6)*m) = 91/12 // - 91/12
8-((5/6)*m)-(91/12) = 0
(-5/6)*m-91/12+8 = 0
5/12-5/6*m = 0 // - 5/12
-5/6*m = -5/12 // : -5/6
m = -5/12/(-5/6)
m = 1/2
m = 1/2
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