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B in (-oo:+oo)
20 = B/(-0.2) // - B/(-0.2)
20-(B/(-0.2)) = 0
5*B+20 = 0
5*B+20 = 0 // - 20
5*B = -20 // : 5
B = -20/5
B = -4
B = -4
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