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b in (-oo:+oo)
-b-1 = 2*b+14 // - 2*b+14
-b-(2*b)-14-1 = 0
-b-2*b-14-1 = 0
-3*b-15 = 0 // + 15
-3*b = 15 // : -3
b = 15/(-3)
b = -5
b = -5
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