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m in (-oo:+oo)
(5/2)*m = (1/8)*m-(1/8) // - (1/8)*m-(1/8)
(5/2)*m-((1/8)*m)+1/8 = 0
(5/2)*m+(-1/8)*m+1/8 = 0
19/8*m+1/8 = 0 // - 1/8
19/8*m = -1/8 // : 19/8
m = -1/8/19/8
m = -1/19
m = -1/19
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