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D( x )
1-((5-(25*x))/4) = 0
1-((5-(25*x))/4) = 0
1-((5-(25*x))/4) = 0
1-((5-25*x)/4) = 0
(-1*(5-25*x))/4+1 = 0
(-1*(5-25*x))/4+(1*4)/4 = 0
1*4-1*(5-25*x) = 0
25*x-1 = 0
(25*x-1)/4 = 0
(25*x-1)/4 = 0 // * 4
25*x-1 = 0
25*x-1 = 0 // + 1
25*x = 1 // : 25
x = 1/25
x in (-oo:1/25) U (1/25:+oo)
4/(1-((5-(25*x))/4)) = 0
4/(1-((5-25*x)/4)) = 0
4/((-1*(5-25*x))/4+1) = 0
(-1*(5-25*x))/4+1 = 0
(-1*(5-25*x))/4+(1*4)/4 = 0
1*4-1*(5-25*x) = 0
25*x-1 = 0
(25*x-1)/4 = 0
(25*x-1)/4 = 0 // * 4
25*x-1 = 0
4/(25*x-1) = 0
x belongs to the empty set
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