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b in (-oo:+oo)
5*b+1/2 = -29/2 // + -29/2
5*b+1/2-(-29/2) = 0
5*b+1/2+29/2 = 0
5*b+15 = 0 // - 15
5*b = -15 // : 5
b = -15/5
b = -3
b = -3
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