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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-2.25/x = 9/6 // - 9/6
-2.25/x-(9/6) = 0
-2.25/x-3/2 = 0
-2.25*x^-1 = 3/2 // : -2.25
x^-1 = -0.66666667
-1 < 0
1/(x^1) = -0.66666667 // * x^1
1 = -0.66666667*x^1 // : -0.66666667
-1.49999999 = x^1
x = -1.49999999
x = -1.49999999
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