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m in (-oo:+oo)
(4/5)*m = 2/3 // - 2/3
(4/5)*m-(2/3) = 0
(4/5)*m-2/3 = 0
4/5*m-2/3 = 0 // + 2/3
4/5*m = 2/3 // : 4/5
m = 2/3/4/5
m = 5/6
m = 5/6
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