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b in (-oo:+oo)
(1/2)*b-4 = 2*b-13 // - 2*b-13
(1/2)*b-(2*b)-4+13 = 0
(1/2)*b-2*b-4+13 = 0
9-3/2*b = 0 // - 9
-3/2*b = -9 // : -3/2
b = -9/(-3/2)
b = 6
b = 6
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