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b in (-oo:+oo)
(5/2)*b = 3^2+11 // - 3^2+11
(5/2)*b-3^2-11 = 0
5/2*b-20 = 0 // + 20
5/2*b = 20 // : 5/2
b = 20/5/2
b = 8
b = 8
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