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D( x )
1-x = 0
1-x = 0
1-x = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x in (-oo:1) U (1:+oo)
1/(1-x)+x = 0
1/(1-x)+(x*(1-x))/(1-x) = 0
x*(1-x)+1 = 0
x-x^2+1 = 0
x-x^2+1 = 0
x-x^2+1 = 0
DELTA = 1^2-(-1*1*4)
DELTA = 5
DELTA > 0
x = (5^(1/2)-1)/(-1*2) or x = (-5^(1/2)-1)/(-1*2)
x = (5^(1/2)-1)/(-2) or x = (5^(1/2)+1)/2
(x-((5^(1/2)-1)/(-2)))*(x-((5^(1/2)+1)/2)) = 0
((x-((5^(1/2)-1)/(-2)))*(x-((5^(1/2)+1)/2)))/(1-x) = 0
((x-((5^(1/2)-1)/(-2)))*(x-((5^(1/2)+1)/2)))/(1-x) = 0 // * 1-x
(x-((5^(1/2)-1)/(-2)))*(x-((5^(1/2)+1)/2)) = 0
( x-((5^(1/2)+1)/2) )
x-((5^(1/2)+1)/2) = 0 // + (5^(1/2)+1)/2
x = (5^(1/2)+1)/2
( x-((5^(1/2)-1)/(-2)) )
x-((5^(1/2)-1)/(-2)) = 0 // + (5^(1/2)-1)/(-2)
x = (5^(1/2)-1)/(-2)
x in { (5^(1/2)+1)/2, (5^(1/2)-1)/(-2) }
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