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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/4.5 = 6/x // - 6/x
3/4.5-(6/x) = 0
3/4.5-6*x^-1 = 0
-6*x^-1 = -0.66666667 // : -6
x^-1 = 0.11111111
-1 < 0
1/(x^1) = 0.11111111 // * x^1
1 = 0.11111111*x^1 // : 0.11111111
9.00000009 = x^1
x = 9.00000009
x = 9.00000009
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