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b in (-oo:+oo)
(1/4)*b^2-16 = 0
1/4*b^2 = 16 // : 1/4
b^2 = 64
b^2 = 64 // ^ 1/2
abs(b) = 8
b = 8 or b = -8
b in { 8, -8 }
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