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