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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)
(2*x+1)/(x-1) = 3 // - 3
(2*x+1)/(x-1)-3 = 0
(2*x+1)/(x-1)+(-3*(x-1))/(x-1) = 0
2*x-3*(x-1)+1 = 0
4-x = 0
(4-x)/(x-1) = 0
(4-x)/(x-1) = 0 // * x-1
4-x = 0
4-x = 0 // - 4
-x = -4 // * -1
x = 4
x = 4
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