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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-(8/(x+2)) // - 2-(8/(x+2))
(4*x)/(x+2)+8/(x+2)-2 = 0
(4*x)/(x+2)+8/(x+2)+(-2*(x+2))/(x+2) = 0
4*x-2*(x+2)+8 = 0
4*x-2*x-4+8 = 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 in { -2}
x belongs to the empty set
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