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b in (-oo:+oo)
(1/4)*b-((3/4)*b)+5 = 6 // - 6
(1/4)*b-((3/4)*b)-6+5 = 0
(1/4)*b+(-3/4)*b-6+5 = 0
-1/2*b-1 = 0 // + 1
-1/2*b = 1 // : -1/2
b = 1/(-1/2)
b = -2
b = -2
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