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b in (-oo:+oo)
b^2 = 49/25 // - 49/25
b^2-(49/25) = 0
b^2-49/25 = 0
1*b^2 = 49/25 // : 1
b^2 = 49/25
b^2 = 49/25 // ^ 1/2
abs(b) = 7/5
b = 7/5 or b = -7/5
b in { 7/5, -7/5 }
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