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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/6 = -35/x // + -35/x
5/6-(-35/x) = 0
35*x^-1+5/6 = 0
35*x^-1 = -5/6 // : 35
x^-1 = -1/42
-1 < 0
1/(x^1) = -1/42 // * x^1
1 = -1/42*x^1 // : -1/42
-42 = x^1
x = -42
x = -42
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