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m in (-oo:+oo)
(5/8)*m-(3/8) = (1/2)*m+7/8 // - (1/2)*m+7/8
(5/8)*m-((1/2)*m)-(3/8)-(7/8) = 0
(5/8)*m+(-1/2)*m-3/8-7/8 = 0
1/8*m-5/4 = 0 // + 5/4
1/8*m = 5/4 // : 1/8
m = 5/4/1/8
m = 10
m = 10
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