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D( x )
x*((2-x)/5) = 0
5-x = 0
x*((2-x)/5) = 0
x*((2-x)/5) = 0
(x*(2-x))/5 = 0
( 2-x )
2-x = 0 // - 2
-x = -2 // * -1
x = 2
( x )
x = 0
5-x = 0
5-x = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
x in (-oo:0) U (0:2) U (2:5) U (5:+oo)
(((4-x)^2)/(5-x))/(x*((2-x)/5)) = 0
(5*(4-x)^2)/(x*(5-x)*(2-x)) = 0
( 4-x )
4-x = 0 // - 4
-x = -4 // * -1
x = 4
( 5 )
5 = 0
x belongs to the empty set
x in { 4, 4 }
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