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b in (-oo:+oo)
b/9-1^2 = 5/18 // - 5/18
b/9-1^2-(5/18) = 0
b/9-5/18-1 = 0
1/9*b-23/18 = 0 // + 23/18
1/9*b = 23/18 // : 1/9
b = 23/18/1/9
b = 23/2
b = 23/2
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