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b in (-oo:+oo)
(1/4)*b^2-(1/100) = 0
(1/4)*b^2-1/100 = 0
1/4*b^2 = 1/100 // : 1/4
b^2 = 1/25
b^2 = 1/25 // ^ 1/2
abs(b) = 1/5
b = 1/5 or b = -1/5
b in { 1/5, -1/5 }
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