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b in (-oo:+oo)
3*(6-(2*b)) = 12 // - 12
3*(6-(2*b))-12 = 0
3*(6-2*b)-12 = 0
3*(6-2*b)-12 = 0
6-6*b = 0
6-6*b = 0
6-6*b = 0 // - 6
-6*b = -6 // : -6
b = -6/(-6)
b = 1
b = 1
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