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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6.2/x = 2/43 // - 2/43
6.2/x-(2/43) = 0
6.2/x-2/43 = 0
6.2*x^-1 = 2/43 // : 6.2
x^-1 = 0.00750188
-1 < 0
1/(x^1) = 0.00750188 // * x^1
1 = 0.00750188*x^1 // : 0.00750188
133.29991949 = x^1
x = 133.29991949
x = 133.29991949
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