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m in (-oo:+oo)
(5/8)*m = 7/8 // - 7/8
(5/8)*m-(7/8) = 0
(5/8)*m-7/8 = 0
5/8*m-7/8 = 0 // + 7/8
5/8*m = 7/8 // : 5/8
m = 7/8/5/8
m = 7/5
m = 7/5
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