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D( x )
x+2 = 0
x = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x = 0
x = 0
x in (-oo:-2) U (-2:0) U (0:+oo)
(5*x-3)/x = (7-x)/(x+2) // - (7-x)/(x+2)
(5*x-3)/x-((7-x)/(x+2)) = 0
(5*x-3)/x+(-1*(7-x))/(x+2) = 0
((5*x-3)*(x+2))/(x*(x+2))+(-1*x*(7-x))/(x*(x+2)) = 0
(5*x-3)*(x+2)-1*x*(7-x) = 0
6*x^2-6 = 0
(6*x^2-6)/(x*(x+2)) = 0
(6*x^2-6)/(x*(x+2)) = 0 // * x*(x+2)
6*x^2-6 = 0
6*x^2 = 6 // : 6
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in { 1, -1 }
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