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b in (-oo:+oo)
b+6 = 6*b-14 // - 6*b-14
b-(6*b)+6+14 = 0
b-6*b+6+14 = 0
20-5*b = 0 // - 20
-5*b = -20 // : -5
b = -20/(-5)
b = 4
b = 4
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