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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/x = 25/9 // - 25/9
16/x-(25/9) = 0
16/x-25/9 = 0
16*x^-1 = 25/9 // : 16
x^-1 = 25/144
-1 < 0
1/(x^1) = 25/144 // * x^1
1 = 25/144*x^1 // : 25/144
144/25 = x^1
x = 144/25
x = 144/25
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