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m in (-oo:+oo)
(2/5)*m = 9/8 // - 9/8
(2/5)*m-(9/8) = 0
(2/5)*m-9/8 = 0
2/5*m-9/8 = 0 // + 9/8
2/5*m = 9/8 // : 2/5
m = 9/8/2/5
m = 45/16
m = 45/16
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