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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x = 3/16 // - 3/16
9/x-(3/16) = 0
9/x-3/16 = 0
9*x^-1 = 3/16 // : 9
x^-1 = 1/48
-1 < 0
1/(x^1) = 1/48 // * x^1
1 = 1/48*x^1 // : 1/48
48 = x^1
x = 48
x = 48
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