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