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D( x )
10-(2*x) = 0
10-(2*x) = 0
10-(2*x) = 0
10-2*x = 0
10-2*x = 0 // - 10
-2*x = -10 // : -2
x = -10/(-2)
x = 5
x in (-oo:5) U (5:+oo)
(25-x^2)/(10-(2*x)) = 0
(25-x^2)/(10-2*x) = 0
-1*x^2 = -25 // : -1
x^2 = 25
x^2 = 25 // ^ 1/2
abs(x) = 5
x = 5 or x = -5
x in { 5}
x = -5
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