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m in (-oo:+oo)
(5*m)/12 = 2/3 // - 2/3
(5*m)/12-(2/3) = 0
(5*m)/12-2/3 = 0
5/12*m-2/3 = 0 // + 2/3
5/12*m = 2/3 // : 5/12
m = 2/3/5/12
m = 8/5
m = 8/5
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