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b in (-oo:+oo)
10*10^-3*b*b = 1/10 // - 1/10
10*10^-3*b*b-(1/10) = 0
10*10^-3*b*b-1/10 = 0
1/100*b^2 = 1/10 // : 1/100
b^2 = 10
b^2 = 10 // ^ 1/2
abs(b) = 10^(1/2)
b = 10^(1/2) or b = -10^(1/2)
b in { 10^(1/2), -10^(1/2) }
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