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b in (-oo:+oo)
-66 = b-6*b-6 // - b-6*b-6
6-(-6*b)-b-66 = 0
6*b-b-66+6 = 0
5*b-60 = 0 // + 60
5*b = 60 // : 5
b = 60/5
b = 12
b = 12
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