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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-4 = -6/x // + -6/x
1/x-(-6/x)-4 = 0
1/x+6*x^-1-4 = 0
7*x^-1 = 4 // : 7
x^-1 = 4/7
-1 < 0
1/(x^1) = 4/7 // * x^1
1 = 4/7*x^1 // : 4/7
7/4 = x^1
x = 7/4
x = 7/4
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