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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/x+2 = 70 // - 70
14/x-70+2 = 0
14*x^-1 = 68 // : 14
x^-1 = 34/7
-1 < 0
1/(x^1) = 34/7 // * x^1
1 = 34/7*x^1 // : 34/7
7/34 = x^1
x = 7/34
x = 7/34
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