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D( x )
10-(5*x) = 0
10-(5*x) = 0
10-(5*x) = 0
10-5*x = 0
10-5*x = 0 // - 10
-5*x = -10 // : -5
x = -10/(-5)
x = 2
x in (-oo:2) U (2:+oo)
(x-2)/(10-(5*x)) = 0
(x-2)/(10-5*x) = 0
x-2 = 0 // + 2
x = 2
x in { 2}
x belongs to the empty set
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