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D( x )
x+2 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:+oo)
25/(x+2) = 5/3 // - 5/3
25/(x+2)-(5/3) = 0
25/(x+2)-5/3 = 0
(3*25)/(3*(x+2))+(-5*(x+2))/(3*(x+2)) = 0
3*25-5*(x+2) = 0
65-5*x = 0
(65-5*x)/(3*(x+2)) = 0
(65-5*x)/(3*(x+2)) = 0 // * 3*(x+2)
65-5*x = 0
65-5*x = 0 // - 65
-5*x = -65 // : -5
x = -65/(-5)
x = 13
x = 13
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