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b in (-oo:+oo)
6*(3*b+6) = 144 // - 144
6*(3*b+6)-144 = 0
6*(3*b+6)-144 = 0
18*b-108 = 0
18*b-108 = 0
18*b-108 = 0 // + 108
18*b = 108 // : 18
b = 108/18
b = 6
b = 6
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