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D( x )
x+1 = 0
2*x+4 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
2*x+4 = 0
2*x+4 = 0
2*x+4 = 0 // - 4
2*x = -4 // : 2
x = -4/2
x = -2
x in (-oo:-2) U (-2:-1) U (-1:+oo)
x/(2*x+4)-((x+4)/(x+1)) = 1 // - 1
x/(2*x+4)-((x+4)/(x+1))-1 = 0
x/(2*x+4)+(-1*(x+4))/(x+1)-1 = 0
(x*(x+1))/((2*x+4)*(x+1))+(-1*(x+4)*(2*x+4))/((2*x+4)*(x+1))+(-1*(2*x+4)*(x+1))/((2*x+4)*(x+1)) = 0
x*(x+1)-1*(x+4)*(2*x+4)-1*(2*x+4)*(x+1) = 0
-x^2-2*x^2-11*x-6*x-16-4 = 0
-3*x^2-17*x-20 = 0
-3*x^2-17*x-20 = 0
-1*(3*x^2+17*x+20) = 0
3*x^2+17*x+20 = 0
DELTA = 17^2-(3*4*20)
DELTA = 49
DELTA > 0
x = (49^(1/2)-17)/(2*3) or x = (-49^(1/2)-17)/(2*3)
x = -5/3 or x = -4
-1*(x+4)*(x+5/3) = 0
(-1*(x+4)*(x+5/3))/((2*x+4)*(x+1)) = 0
(-1*(x+4)*(x+5/3))/((2*x+4)*(x+1)) = 0 // * (2*x+4)*(x+1)
-1*(x+4)*(x+5/3) = 0
( x+4 )
x+4 = 0 // - 4
x = -4
( x+5/3 )
x+5/3 = 0 // - 5/3
x = -5/3
x in { -4, -5/3 }
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