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