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D( x )
x+2 = 0
x = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x = 0
x = 0
x in (-oo:-2) U (-2:0) U (0:+oo)
3/x-(1/(x+2)) = 1 // - 1
3/x-(1/(x+2))-1 = 0
3/x-(x+2)^-1-1 = 0
3/x-1/(x+2)-1 = 0
(-1*x)/(x*(x+2))+(3*(x+2))/(x*(x+2))+(-1*x*(x+2))/(x*(x+2)) = 0
3*(x+2)-1*x*(x+2)-1*x = 0
2*x-x^2-2*x+6 = 0
6-x^2 = 0
(6-x^2)/(x*(x+2)) = 0
(6-x^2)/(x*(x+2)) = 0 // * x*(x+2)
6-x^2 = 0
-1*x^2 = -6 // : -1
x^2 = 6
x^2 = 6 // ^ 1/2
abs(x) = 6^(1/2)
x = 6^(1/2) or x = -6^(1/2)
x in { 6^(1/2), -6^(1/2) }
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