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b in (-oo:+oo)
(3/4)*b-2 = (-7/(-8))*b+3 // - (-7/(-8))*b+3
(3/4)*b-((-7/(-8))*b)-3-2 = 0
(3/4)*b+(-7/8)*b-3-2 = 0
-1/8*b-5 = 0 // + 5
-1/8*b = 5 // : -1/8
b = 5/(-1/8)
b = -40
b = -40
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