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D( x )
x+1 = 0
x+3 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:-1) U (-1:+oo)
((x+2)/(x+3)-(x/(x+1)))/2 = 0
((x+2)/(x+3)+(-1*x)/(x+1))/2 = 0
(x+2)/(x+3)+(-1*x)/(x+1) = 0
((x+2)*(x+1))/((x+3)*(x+1))+(-1*x*(x+3))/((x+3)*(x+1)) = 0
(x+2)*(x+1)-1*x*(x+3) = 0
2 = 0
2/((x+3)*(x+1)) = 0
2/((x+3)*(x+1)) = 0 // * (x+3)*(x+1)
2 = 0
2/2 = 0
x belongs to the empty set
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