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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/25 = 35/x // - 35/x
18/25-(35/x) = 0
18/25-35*x^-1 = 0
-35*x^-1 = -18/25 // : -35
x^-1 = 18/875
-1 < 0
1/(x^1) = 18/875 // * x^1
1 = 18/875*x^1 // : 18/875
875/18 = x^1
x = 875/18
x = 875/18
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