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b in (-oo:+oo)
(1/3)*(b+12)-b-12 = 0
1/3*(b+12)-b-12 = 0
1/3*(b+12)-b-12 = 0
4-2/3*b-12 = 0
-2/3*b-8 = 0
-2/3*b-8 = 0
-2/3*b-8 = 0 // + 8
-2/3*b = 8 // : -2/3
b = 8/(-2/3)
b = -12
b = -12
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