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m in (-oo:+oo)
-7*m-(5/6) = -223/66 // + -223/66
-7*m-(5/6)-(-223/66) = 0
223/66-7*m-5/6 = 0
28/11-7*m = 0 // - 28/11
-7*m = -28/11 // : -7
m = -28/11/(-7)
m = 4/11
m = 4/11
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