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b in (-oo:+oo)
5-((1/2)*(b-6)) = 4 // - 4
5-((1/2)*(b-6))-4 = 0
(-1/2)*(b-6)-4+5 = 0
5-1/2*(b-6)-4 = 0
5-1/2*(b-6)-4 = 0
5-1/2*b-1 = 0
4-1/2*b = 0
4-1/2*b = 0
4-1/2*b = 0 // - 4
-1/2*b = -4 // : -1/2
b = -4/(-1/2)
b = 8
b = 8
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