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b in (-oo:+oo)
b-6 = 3*b-30 // - 3*b-30
b-(3*b)-6+30 = 0
b-3*b-6+30 = 0
24-2*b = 0 // - 24
-2*b = -24 // : -2
b = -24/(-2)
b = 12
b = 12
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