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b in (-oo:+oo)
-6*b-4 = 6*b-16 // - 6*b-16
16-6*b-(6*b)-4 = 0
16-6*b-6*b-4 = 0
12-12*b = 0 // - 12
-12*b = -12 // : -12
b = -12/(-12)
b = 1
b = 1
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