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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
8*y = (4*x)/(x-1) // - (4*x)/(x-1)
8*y-((4*x)/(x-1)) = 0
8*y-4*x*(x-1)^-1 = 0
(-4*x)/(x-1)+8*y = 0
(-4*x)/(x-1)+(8*y*(x-1))/(x-1) = 0
8*y*(x-1)-4*x = 0
8*x*y-4*x-8*y = 0
8*x*y-4*x-8*y = 0
4*(2*x*y-x-2*y) = 0
2*x*y-2*y = 0 // + -2*y
2*x*y = -(-2*y) // : 2*y
x = (-(-2*y))/(2*y)
x = 1
4*(x-1) = 0
(4*(x-1))/(x-1) = 0
(4*(x-1))/(x-1) = 0 // * x-1
4*(x-1) = 0
( 4 )
4 = 0
x belongs to the empty set
( x-1 )
x-1 = 0 // + 1
x = 1
x in { 1}
x belongs to the empty set
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