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