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b in (-oo:+oo)
b^2 = 9/16 // - 9/16
b^2-(9/16) = 0
b^2-9/16 = 0
1*b^2 = 9/16 // : 1
b^2 = 9/16
b^2 = 9/16 // ^ 1/2
abs(b) = 3/4
b = 3/4 or b = -3/4
b in { 3/4, -3/4 }
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