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b in (-oo:+oo)
-12 = 3*b+6*b+6 // - 3*b+6*b+6
-(3*b)-(6*b)-12-6 = 0
-3*b-6*b-12-6 = 0
-9*b-18 = 0 // + 18
-9*b = 18 // : -9
b = 18/(-9)
b = -2
b = -2
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