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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 1.19 // - 1.19
7/x-1.19 = 0
7*x^-1 = 1.19 // : 7
x^-1 = 0.17
-1 < 0
1/(x^1) = 0.17 // * x^1
1 = 0.17*x^1 // : 0.17
5.88235294 = x^1
x = 5.88235294
x = 5.88235294
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