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D( x )
x+2 = 0
x+1 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-2) U (-2:-1) U (-1:+oo)
x/(x+1)-(3/(x+2)) = 1 // - 1
x/(x+1)-(3/(x+2))-1 = 0
x/(x+1)-3*(x+2)^-1-1 = 0
x/(x+1)-3/(x+2)-1 = 0
(x*(x+2))/((x+1)*(x+2))+(-3*(x+1))/((x+1)*(x+2))+(-1*(x+1)*(x+2))/((x+1)*(x+2)) = 0
x*(x+2)-3*(x+1)-1*(x+1)*(x+2) = 0
x^2-x^2-x-3*x-3-2 = 0
-4*x-5 = 0
(-4*x-5)/((x+1)*(x+2)) = 0
(-4*x-5)/((x+1)*(x+2)) = 0 // * (x+1)*(x+2)
-4*x-5 = 0
-4*x-5 = 0 // + 5
-4*x = 5 // : -4
x = 5/(-4)
x = -5/4
x = -5/4
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