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b in (-oo:+oo)
6*b+7 = 4*b+31 // - 4*b+31
6*b-(4*b)-31+7 = 0
6*b-4*b-31+7 = 0
2*b-24 = 0 // + 24
2*b = 24 // : 2
b = 24/2
b = 12
b = 12
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