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D( x )
10-x = 0
10-x = 0
10-x = 0
10-x = 0 // - 10
-x = -10 // * -1
x = 10
x in (-oo:10) U (10:+oo)
5 = x/(10-x) // - x/(10-x)
5-(x/(10-x)) = 0
(-1*x)/(10-x)+5 = 0
(-1*x)/(10-x)+(5*(10-x))/(10-x) = 0
5*(10-x)-1*x = 0
50-6*x = 0
(50-6*x)/(10-x) = 0
(50-6*x)/(10-x) = 0 // * 10-x
50-6*x = 0
50-6*x = 0 // - 50
-6*x = -50 // : -6
x = -50/(-6)
x = 25/3
x = 25/3
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