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D( x )
x+4 = 0
5*x+2 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
5*x+2 = 0
5*x+2 = 0
5*x+2 = 0 // - 2
5*x = -2 // : 5
x = -2/5
x in (-oo:-4) U (-4:-2/5) U (-2/5:+oo)
(5*x-2)/(5*x+2) = (x+2)/(x+4) // - (x+2)/(x+4)
(5*x-2)/(5*x+2)-((x+2)/(x+4)) = 0
(5*x-2)/(5*x+2)+(-1*(x+2))/(x+4) = 0
((5*x-2)*(x+4))/((5*x+2)*(x+4))+(-1*(x+2)*(5*x+2))/((5*x+2)*(x+4)) = 0
(5*x-2)*(x+4)-1*(x+2)*(5*x+2) = 0
6*x-12 = 0
(6*x-12)/((5*x+2)*(x+4)) = 0
(6*x-12)/((5*x+2)*(x+4)) = 0 // * (5*x+2)*(x+4)
6*x-12 = 0
6*x-12 = 0 // + 12
6*x = 12 // : 6
x = 12/6
x = 2
x = 2
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