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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/1.6 = 9/x // - 9/x
6/1.6-(9/x) = 0
6/1.6-9*x^-1 = 0
-9*x^-1 = -3.75 // : -9
x^-1 = 0.41666667
-1 < 0
1/(x^1) = 0.41666667 // * x^1
1 = 0.41666667*x^1 // : 0.41666667
2.39999998 = x^1
x = 2.39999998
x = 2.39999998
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