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b in (-oo:+oo)
5*b+(1/2)*b-3 = -17/2 // + -17/2
5*b+(1/2)*b-(-17/2)-3 = 0
5*b+(1/2)*b+17/2-3 = 0
11/2*b+11/2 = 0 // - 11/2
11/2*b = -11/2 // : 11/2
b = -11/2/11/2
b = -1
b = -1
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