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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.42/x = 0.6 // - 0.6
0.42/x-0.6 = 0
0.42*x^-1 = 0.6 // : 0.42
x^-1 = 1.42857143
-1 < 0
1/(x^1) = 1.42857143 // * x^1
1 = 1.42857143*x^1 // : 1.42857143
0.7 = x^1
x = 0.7
x = 0.7
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