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b in (-oo:+oo)
3*(6-6*b) = 216 // - 216
3*(6-6*b)-216 = 0
3*(6-6*b)-216 = 0
-18*b-198 = 0
-18*b-198 = 0
-18*b-198 = 0 // + 198
-18*b = 198 // : -18
b = 198/(-18)
b = -11
b = -11
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