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