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D( x )
4*x-4 = 0
x-1 = 0
4*x-4 = 0
4*x-4 = 0
4*x-4 = 0 // + 4
4*x = 4 // : 4
x = 4/4
x = 1
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
1/(x-1)+1/(4*x-4) = 5/4 // - 5/4
1/(x-1)+1/(4*x-4)-(5/4) = 0
1/(x-1)+1/(4*x-4)-5/4 = 0
(1*4*(4*x-4))/(4*(x-1)*(4*x-4))+(1*4*(x-1))/(4*(x-1)*(4*x-4))+(-5*(x-1)*(4*x-4))/(4*(x-1)*(4*x-4)) = 0
1*4*(4*x-4)+1*4*(x-1)-5*(x-1)*(4*x-4) = 0
20*x-20*x^2+40*x-20-20 = 0
60*x-20*x^2-40 = 0
60*x-20*x^2-40 = 0
20*(3*x-x^2-2) = 0
3*x-x^2-2 = 0
DELTA = 3^2-(-2*(-1)*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)-3)/(-1*2) or x = (-1^(1/2)-3)/(-1*2)
x = 1 or x = 2
20*(x-1)*(x-2) = 0
(20*(x-1)*(x-2))/(4*(x-1)*(4*x-4)) = 0
(20*(x-1)*(x-2))/(4*(x-1)*(4*x-4)) = 0 // * 4*(x-1)*(4*x-4)
20*(x-1)*(x-2) = 0
( x-1 )
x-1 = 0 // + 1
x = 1
( x-2 )
x-2 = 0 // + 2
x = 2
x in { 1}
x = 2
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