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b in (-oo:+oo)
4*b-(6*b)+1 = -15 // + 15
4*b-(6*b)+1+15 = 0
4*b-6*b+1+15 = 0
16-2*b = 0 // - 16
-2*b = -16 // : -2
b = -16/(-2)
b = 8
b = 8
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