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D( x )
5*x-8 = 0
3*x+5 = 0
5*x-8 = 0
5*x-8 = 0
5*x-8 = 0 // + 8
5*x = 8 // : 5
x = 8/5
3*x+5 = 0
3*x+5 = 0
3*x+5 = 0 // - 5
3*x = -5 // : 3
x = -5/3
x in (-oo:-5/3) U (-5/3:8/5) U (8/5:+oo)
3/(5*x-8) = 2/(3*x+5) // - 2/(3*x+5)
3/(5*x-8)-(2/(3*x+5)) = 0
3/(5*x-8)-2*(3*x+5)^-1 = 0
3/(5*x-8)-2/(3*x+5) = 0
(3*(3*x+5))/((5*x-8)*(3*x+5))+(-2*(5*x-8))/((5*x-8)*(3*x+5)) = 0
3*(3*x+5)-2*(5*x-8) = 0
31-x = 0
(31-x)/((5*x-8)*(3*x+5)) = 0
(31-x)/((5*x-8)*(3*x+5)) = 0 // * (5*x-8)*(3*x+5)
31-x = 0
31-x = 0 // - 31
-x = -31 // * -1
x = 31
x = 31
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