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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/4.5 = 4/x // - 4/x
12/4.5-(4/x) = 0
12/4.5-4*x^-1 = 0
-4*x^-1 = -2.66666667 // : -4
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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