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m in (-oo:+oo)
(3/4)*m-4 = (-7/8)*m+1 // - (-7/8)*m+1
(3/4)*m-((-7/8)*m)-4-1 = 0
(3/4)*m+(7/8)*m-4-1 = 0
13/8*m-5 = 0 // + 5
13/8*m = 5 // : 13/8
m = 5/13/8
m = 40/13
m = 40/13
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