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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = -9/35 // + -9/35
1/x-(-9/35) = 0
1/x+9/35 = 0
1*x^-1 = -9/35 // : 1
x^-1 = -9/35
-1 < 0
1/(x^1) = -9/35 // * x^1
1 = -9/35*x^1 // : -9/35
-35/9 = x^1
x = -35/9
x = -35/9
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