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B in (-oo:+oo)
(1/2)*B = B-4 // - B-4
(1/2)*B-B+4 = 0
4-1/2*B = 0 // - 4
-1/2*B = -4 // : -1/2
B = -4/(-1/2)
B = 8
B = 8
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