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m in (-oo:+oo)
7/12-m = 5/6 // - 5/6
7/12-m-(5/6) = 0
7/12-m-5/6 = 0
-m-1/4 = 0 // + 1/4
-m = 1/4 // * -1
m = -1/4
m = -1/4
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