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b in (-oo:+oo)
2*b-(6*b)-6 = 42 // - 42
2*b-(6*b)-42-6 = 0
2*b-6*b-42-6 = 0
-4*b-48 = 0 // + 48
-4*b = 48 // : -4
b = 48/(-4)
b = -12
b = -12
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