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D( x )
x-2 = 0
2*x+2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
2*x+2 = 0
2*x+2 = 0
2*x+2 = 0 // - 2
2*x = -2 // : 2
x = -2/2
x = -1
x in (-oo:-1) U (-1:2) U (2:+oo)
2/(x-2) = 5/(2*x+2) // - 5/(2*x+2)
2/(x-2)-(5/(2*x+2)) = 0
2/(x-2)-5*(2*x+2)^-1 = 0
2/(x-2)-5/(2*x+2) = 0
(2*(2*x+2))/((x-2)*(2*x+2))+(-5*(x-2))/((x-2)*(2*x+2)) = 0
2*(2*x+2)-5*(x-2) = 0
14-x = 0
(14-x)/((x-2)*(2*x+2)) = 0
(14-x)/((x-2)*(2*x+2)) = 0 // * (x-2)*(2*x+2)
14-x = 0
14-x = 0 // - 14
-x = -14 // * -1
x = 14
x = 14
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