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m in (-oo:+oo)
9*(m-(1/3)) = 9 // - 9
9*(m-(1/3))-9 = 0
9*(m-1/3)-9 = 0
9*(m-1/3)-9 = 0
9*m-12 = 0
9*m-12 = 0
9*m-12 = 0 // + 12
9*m = 12 // : 9
m = 12/9
m = 4/3
m = 4/3
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