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m in (-oo:+oo)
(4/5)*m-(1/2) = 2/3 // - 2/3
(4/5)*m-(1/2)-(2/3) = 0
(4/5)*m-1/2-2/3 = 0
4/5*m-7/6 = 0 // + 7/6
4/5*m = 7/6 // : 4/5
m = 7/6/4/5
m = 35/24
m = 35/24
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