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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.9/3.3 = 0.6/x // - 0.6/x
0.9/3.3-(0.6/x) = 0
0.9/3.3-0.6*x^-1 = 0
-0.6*x^-1 = -0.27272727 // : -0.6
x^-1 = 0.45454545
-1 < 0
1/(x^1) = 0.45454545 // * x^1
1 = 0.45454545*x^1 // : 0.45454545
2.20000002 = x^1
x = 2.20000002
x = 2.20000002
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