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b in (-oo:+oo)
2*(-(6*b)-6) = -72 // + 72
2*(-(6*b)-6)+72 = 0
2*(-6*b-6)+72 = 0
2*(-6*b-6)+72 = 0
60-12*b = 0
60-12*b = 0
60-12*b = 0 // - 60
-12*b = -60 // : -12
b = -60/(-12)
b = 5
b = 5
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