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b in (-oo:+oo)
(1/2)*b = 9/2 // - 9/2
(1/2)*b-(9/2) = 0
(1/2)*b-9/2 = 0
1/2*b-9/2 = 0 // + 9/2
1/2*b = 9/2 // : 1/2
b = 9/2/1/2
b = 9
b = 9
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