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m in (-oo:+oo)
(2/5)*m-(1/5) = 9/50 // - 9/50
(2/5)*m-(1/5)-(9/50) = 0
(2/5)*m-1/5-9/50 = 0
2/5*m-19/50 = 0 // + 19/50
2/5*m = 19/50 // : 2/5
m = 19/50/2/5
m = 19/20
m = 19/20
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