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b in (-oo:+oo)
((1/4)*b-2)*((1/4)*b-2) = 0
(1/4*b-2)^2 = 0
1/4*b-2 = 0 // + 2
1/4*b = 2 // : 1/4
b = 2/1/4
b = 8
b in { 8, 8 }
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