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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3/x-1)*(2/x-2) = 0
(3*x^-1-1)*(2*x^-1-2) = 0
( 2*x^-1-2 )
2*x^-1 = 2 // : 2
x^-1 = 1
-1 < 0
1/(x^1) = 1 // * x^1
1 = 1*x^1 // : 1
1 = x^1
x = 1
( 3*x^-1-1 )
3*x^-1 = 1 // : 3
x^-1 = 1/3
-1 < 0
1/(x^1) = 1/3 // * x^1
1 = 1/3*x^1 // : 1/3
3 = x^1
x = 3
x in { 1, 3 }
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