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