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D( x )
x+x-5-2 = 0
x+x-5-2 = 0
x+x-5-2 = 0
2*x-7 = 0 // + 7
2*x = 7 // : 2
x = 7/2
x in (-oo:7/2) U (7/2:+oo)
(2-x)/(x+x-5-2) = 0
(2-x)/(2*x-7) = 0
2-x = 0 // - 2
-x = -2 // * -1
x = 2
x = 2
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