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