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D( x )
x+5 = 0
x-3 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:-5) U (-5:3) U (3:+oo)
(2*x+1)/(x-3)-((x-4)/(x+5)) = -((10*x+13)/(x+5)) // + (10*x+13)/(x+5)
(2*x+1)/(x-3)-((x-4)/(x+5))+(10*x+13)/(x+5) = 0
(2*x+1)/(x-3)+(-1*(x-4))/(x+5)+(10*x+13)/(x+5) = 0
((2*x+1)*(x+5))/((x-3)*(x+5))+(-1*(x-4)*(x-3))/((x-3)*(x+5))+((10*x+13)*(x-3))/((x-3)*(x+5)) = 0
(2*x+1)*(x+5)-1*(x-4)*(x-3)+(10*x+13)*(x-3) = 0
x^2+10*x^2+18*x-17*x-39-7 = 0
11*x^2+x-46 = 0
11*x^2+x-46 = 0
11*x^2+x-46 = 0
DELTA = 1^2-(-46*4*11)
DELTA = 2025
DELTA > 0
x = (2025^(1/2)-1)/(2*11) or x = (-2025^(1/2)-1)/(2*11)
x = 2 or x = -23/11
(x+23/11)*(x-2) = 0
((x+23/11)*(x-2))/((x-3)*(x+5)) = 0
((x+23/11)*(x-2))/((x-3)*(x+5)) = 0 // * (x-3)*(x+5)
(x+23/11)*(x-2) = 0
( x+23/11 )
x+23/11 = 0 // - 23/11
x = -23/11
( x-2 )
x-2 = 0 // + 2
x = 2
x in { -23/11, 2 }
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