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b in (-oo:+oo)
b-2 = 4*b+19 // - 4*b+19
b-(4*b)-19-2 = 0
b-4*b-19-2 = 0
-3*b-21 = 0 // + 21
-3*b = 21 // : -3
b = 21/(-3)
b = -7
b = -7
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