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D( x )
x+5 = 0
1-(4*x) = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
1-(4*x) = 0
1-(4*x) = 0
1-4*x = 0
1-4*x = 0 // - 1
-4*x = -1 // : -4
x = -1/(-4)
x = 1/4
x in (-oo:-5) U (-5:1/4) U (1/4:+oo)
(3*x-2)/(1-(4*x)) = (x-3)/(x+5) // - (x-3)/(x+5)
(3*x-2)/(1-(4*x))-((x-3)/(x+5)) = 0
(3*x-2)/(1-4*x)-((x-3)/(x+5)) = 0
(3*x-2)/(1-4*x)+(-1*(x-3))/(x+5) = 0
((3*x-2)*(x+5))/((1-4*x)*(x+5))+(-1*(x-3)*(1-4*x))/((1-4*x)*(x+5)) = 0
(3*x-2)*(x+5)-1*(x-3)*(1-4*x) = 0
7*x^2-7 = 0
(7*x^2-7)/((1-4*x)*(x+5)) = 0
(7*x^2-7)/((1-4*x)*(x+5)) = 0 // * (1-4*x)*(x+5)
7*x^2-7 = 0
7*x^2 = 7 // : 7
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in { 1, -1 }
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