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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 1.8 // - 1.8
3/x-1.8 = 0
3*x^-1 = 1.8 // : 3
x^-1 = 0.6
-1 < 0
1/(x^1) = 0.6 // * x^1
1 = 0.6*x^1 // : 0.6
1.66666667 = x^1
x = 1.66666667
x = 1.66666667
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