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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)
(4*x)/(x+2) = 2 // - 2
(4*x)/(x+2)-2 = 0
(4*x)/(x+2)+(-2*(x+2))/(x+2) = 0
4*x-2*(x+2) = 0
2*x-4 = 0
(2*x-4)/(x+2) = 0
(2*x-4)/(x+2) = 0 // * x+2
2*x-4 = 0
2*x-4 = 0 // + 4
2*x = 4 // : 2
x = 4/2
x = 2
x = 2
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