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b in (-oo:+oo)
3*(6-(3*b)) = 108 // - 108
3*(6-(3*b))-108 = 0
3*(6-3*b)-108 = 0
3*(6-3*b)-108 = 0
-9*b-90 = 0
-9*b-90 = 0
-9*b-90 = 0 // + 90
-9*b = 90 // : -9
b = 90/(-9)
b = -10
b = -10
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