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b in (-oo:+oo)
4*b+7 = 2*b+17 // - 2*b+17
4*b-(2*b)-17+7 = 0
4*b-2*b-17+7 = 0
2*b-10 = 0 // + 10
2*b = 10 // : 2
b = 10/2
b = 5
b = 5
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