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m in (-oo:+oo)
(2/5)*m = 4/25 // - 4/25
(2/5)*m-(4/25) = 0
(2/5)*m-4/25 = 0
2/5*m-4/25 = 0 // + 4/25
2/5*m = 4/25 // : 2/5
m = 4/25/2/5
m = 2/5
m = 2/5
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