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B in (-oo:+oo)
17.5 = B/1+(1*B)/30 // - B/1+(1*B)/30
17.5-(B/1)-((1*B)/30) = 0
17.5-B-(B/30) = 0
17.5-31/30*B = 0 // - 17.5
-31/30*B = -17.5 // : -31/30
B = -17.5/(-31/30)
B = 16.93548393
B = 16.93548393
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