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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
64 = 36/x // - 36/x
64-(36/x) = 0
64-36*x^-1 = 0
-36*x^-1 = -64 // : -36
x^-1 = 16/9
-1 < 0
1/(x^1) = 16/9 // * x^1
1 = 16/9*x^1 // : 16/9
9/16 = x^1
x = 9/16
x = 9/16
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