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b in (-oo:+oo)
-2*b-3 = 2*b-19 // - 2*b-19
19-2*b-(2*b)-3 = 0
19-2*b-2*b-3 = 0
16-4*b = 0 // - 16
-4*b = -16 // : -4
b = -16/(-4)
b = 4
b = 4
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