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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
70/x = 8 // - 8
70/x-8 = 0
70*x^-1 = 8 // : 70
x^-1 = 4/35
-1 < 0
1/(x^1) = 4/35 // * x^1
1 = 4/35*x^1 // : 4/35
35/4 = x^1
x = 35/4
x = 35/4
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