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m in (-oo:+oo)
(5/8)*m = 1/2 // - 1/2
(5/8)*m-(1/2) = 0
(5/8)*m-1/2 = 0
5/8*m-1/2 = 0 // + 1/2
5/8*m = 1/2 // : 5/8
m = 1/2/5/8
m = 4/5
m = 4/5
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