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