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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+2)/2) = 0
2/(x-1)+(-1*(x+2))/2 = 0
(2^2)/(2*(x-1))+(-1*(x+2)*(x-1))/(2*(x-1)) = 0
4-1*(x+2)*(x-1) = 0
6-x^2-x = 0
6-x^2-x = 0
6-x^2-x = 0
DELTA = (-1)^2-(-1*4*6)
DELTA = 25
DELTA > 0
x = (25^(1/2)+1)/(-1*2) or x = (1-25^(1/2))/(-1*2)
x = -3 or x = 2
(x+3)*(x-2) = 0
((x+3)*(x-2))/(2*(x-1)) = 0
((x+3)*(x-2))/(2*(x-1)) = 0 // * 2*(x-1)
(x+3)*(x-2) = 0
( x+3 )
x+3 = 0 // - 3
x = -3
( x-2 )
x-2 = 0 // + 2
x = 2
x in { -3, 2 }
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