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b in (-oo:+oo)
3*b+1 = 6*b+31 // - 6*b+31
3*b-(6*b)-31+1 = 0
3*b-6*b-31+1 = 0
-3*b-30 = 0 // + 30
-3*b = 30 // : -3
b = 30/(-3)
b = -10
b = -10
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