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m in (-oo:+oo)
7*m-(5/6) = -19/6 // + -19/6
7*m-(5/6)-(-19/6) = 0
7*m-5/6+19/6 = 0
7*m+7/3 = 0 // - 7/3
7*m = -7/3 // : 7
m = -7/3/7
m = -1/3
m = -1/3
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