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b in (-oo:+oo)
(1/2)*b-16 = 2*b+4 // - 2*b+4
(1/2)*b-(2*b)-16-4 = 0
(1/2)*b-2*b-16-4 = 0
-3/2*b-20 = 0 // + 20
-3/2*b = 20 // : -3/2
b = 20/(-3/2)
b = -40/3
b = -40/3
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