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D( B )
B = 0
B = 0
B = 0
B in (-oo:0) U (0:+oo)
6 = (2*18)/B // - (2*18)/B
6-((2*18)/B) = 0
6-36*B^-1 = 0
-36*B^-1 = -6 // : -36
B^-1 = 1/6
-1 < 0
1/(B^1) = 1/6 // * B^1
1 = 1/6*B^1 // : 1/6
6 = B^1
B = 6
B = 6
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