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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
(2/(x-3))*(x-2)+(3/(x-3))*(x+3) = 0
(2*(x-2))/(x-3)+(3*(x+3))/(x-3) = 0
2*(x-2)+3*(x+3) = 0
5*x+5 = 0
(5*x+5)/(x-3) = 0
(5*x+5)/(x-3) = 0 // * x-3
5*x+5 = 0
5*x+5 = 0 // - 5
5*x = -5 // : 5
x = -5/5
x = -1
x = -1
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