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b in (-oo:+oo)
(5*b)/2 = 27.5 // - 27.5
(5*b)/2-27.5 = 0
5/2*b-27.5 = 0 // + 27.5
5/2*b = 27.5 // : 5/2
b = 27.5/5/2
b = 11
b = 11
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