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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9 = 70/x // - 70/x
9-(70/x) = 0
9-70*x^-1 = 0
-70*x^-1 = -9 // : -70
x^-1 = 9/70
-1 < 0
1/(x^1) = 9/70 // * x^1
1 = 9/70*x^1 // : 9/70
70/9 = x^1
x = 70/9
x = 70/9
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