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D( x )
2-x = 0
3-x = 0
2-x = 0
2-x = 0
2-x = 0 // - 2
-x = -2 // * -1
x = 2
3-x = 0
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x in (-oo:2) U (2:3) U (3:+oo)
3/(3-x) = 4/(2-x) // - 4/(2-x)
3/(3-x)-(4/(2-x)) = 0
3/(3-x)-4*(2-x)^-1 = 0
3/(3-x)-4/(2-x) = 0
(3*(2-x))/((3-x)*(2-x))+(-4*(3-x))/((3-x)*(2-x)) = 0
3*(2-x)-4*(3-x) = 0
x-6 = 0
(x-6)/((3-x)*(2-x)) = 0
(x-6)/((3-x)*(2-x)) = 0 // * (3-x)*(2-x)
x-6 = 0
x-6 = 0 // + 6
x = 6
x = 6
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