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