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D( x )
-5*x-25 = 0
-5*x-25 = 0
-5*x-25 = 0
-5*x-25 = 0 // + 25
-5*x = 25 // : -5
x = 25/(-5)
x = -5
x in (-oo:-5) U (-5:+oo)
(x+5)/(-5*x-25) = 0
x+5 = 0 // - 5
x = -5
x in { -5}
x belongs to the empty set
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