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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
Y = 4/(x-2)+1 // - 4/(x-2)+1
Y-(4/(x-2))-1 = 0
Y-4*(x-2)^-1-1 = 0
Y-4/(x-2)-1 = 0
(Y*(x-2))/(x-2)-4/(x-2)+(-1*(x-2))/(x-2) = 0
Y*(x-2)-1*(x-2)-4 = 0
Y*x-2*Y-x-4+2 = 0
Y*x-2*Y-x-2 = 0
Y*x-2*Y-x-2 = 0
-2*Y-x-2 = 0 // + -2*Y-2
-x = -(-2*Y-2) // * -1
x = -2*Y-2
2*Y+x+2 = 0
(2*Y+x+2)/(x-2) = 0
(2*Y+x+2)/(x-2) = 0 // * x-2
2*Y+x+2 = 0
2*Y+x+2 = 0 // - 2*Y+2
x = -(2*Y+2)
x = -(2*Y+2)
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