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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
B-(a/x) = 0
-a*x^-1 = -B // : -a
x^-1 = B/a
-1 < 0
1/(x^1) = B/a // * x^1
1 = (B/a)*x^1 // : B/a
1/(B/a) = x^1
x = 1/(B/a)
x = 1/(B/a)
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