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D( x )
11-x = 0
5-x = 0
11-x = 0
11-x = 0
11-x = 0 // - 11
-x = -11 // * -1
x = 11
5-x = 0
5-x = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
x in (-oo:5) U (5:11) U (11:+oo)
X/(5-x) = -2/(11-x) // + -2/(11-x)
X/(5-x)-(-2/(11-x)) = 0
X/(5-x)+2*(11-x)^-1 = 0
X/(5-x)+2/(11-x) = 0
(X*(11-x))/((5-x)*(11-x))+(2*(5-x))/((5-x)*(11-x)) = 0
X*(11-x)+2*(5-x) = 0
11*X-(X*x)-2*x+10 = 0
(11*X-(X*x)-2*x+10)/((5-x)*(11-x)) = 0
(11*X-(X*x)-2*x+10)/((5-x)*(11-x)) = 0 // * (5-x)*(11-x)
11*X-(X*x)-2*x+10 = 0
11*X-2*x+10 = 0 // - 11*X+10
-2*x = -(11*X+10) // : -2
x = (-(11*X+10))/(-2)
x = (11*X+10)/2
x = (11*X+10)/2
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