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b in (-oo:+oo)
5*b+1 = 2*b+31 // - 2*b+31
5*b-(2*b)-31+1 = 0
5*b-2*b-31+1 = 0
3*b-30 = 0 // + 30
3*b = 30 // : 3
b = 30/3
b = 10
b = 10
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