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D( x )
3-(2*x) = 0
3-(2*x) = 0
3-(2*x) = 0
3-2*x = 0
3-2*x = 0 // - 3
-2*x = -3 // : -2
x = -3/(-2)
x = 3/2
x in (-oo:3/2) U (3/2:+oo)
(2-x)/(3-(2*x)) = 0
(2-x)/(3-2*x) = 0
2-x = 0 // - 2
-x = -2 // * -1
x = 2
x = 2
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