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D( X )
X-5 = 0
X-5 = 0
X-5 = 0
X-5 = 0 // + 5
X = 5
X in (-oo:5) U (5:+oo)
14/(X-5) = 2/3 // - 2/3
14/(X-5)-(2/3) = 0
14/(X-5)-2/3 = 0
(3*14)/(3*(X-5))+(-2*(X-5))/(3*(X-5)) = 0
3*14-2*(X-5) = 0
52-2*X = 0
(52-2*X)/(3*(X-5)) = 0
(52-2*X)/(3*(X-5)) = 0 // * 3*(X-5)
52-2*X = 0
52-2*X = 0 // - 52
-2*X = -52 // : -2
X = -52/(-2)
X = 26
X = 26
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