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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6.8 = 4/x // - 4/x
6.8-(4/x) = 0
6.8-4*x^-1 = 0
-4*x^-1 = -6.8 // : -4
x^-1 = 1.7
-1 < 0
1/(x^1) = 1.7 // * x^1
1 = 1.7*x^1 // : 1.7
0.58823529 = x^1
x = 0.58823529
x = 0.58823529
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