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m in (-oo:+oo)
(2/3)*m-(1/2) = 4/5 // - 4/5
(2/3)*m-(1/2)-(4/5) = 0
(2/3)*m-1/2-4/5 = 0
2/3*m-13/10 = 0 // + 13/10
2/3*m = 13/10 // : 2/3
m = 13/10/2/3
m = 39/20
m = 39/20
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