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D( x )
5*x+6 = 0
5*x-4 = 0
5*x+6 = 0
5*x+6 = 0
5*x+6 = 0 // - 6
5*x = -6 // : 5
x = -6/5
5*x-4 = 0
5*x-4 = 0
5*x-4 = 0 // + 4
5*x = 4 // : 5
x = 4/5
x in (-oo:-6/5) U (-6/5:4/5) U (4/5:+oo)
x/(5*x+6)-((2*x)/(5*x-4)) = 0
x/(5*x+6)-2*x*(5*x-4)^-1 = 0
x/(5*x+6)+(-2*x)/(5*x-4) = 0
(x*(5*x-4))/((5*x+6)*(5*x-4))+(-2*x*(5*x+6))/((5*x+6)*(5*x-4)) = 0
x*(5*x-4)-2*x*(5*x+6) = 0
-5*x^2-16*x = 0
-5*x^2-16*x = 0
-x*(5*x+16) = 0
5*x+16 = 0 // - 16
5*x = -16 // : 5
x = -16/5
-x*(x+16/5) = 0
(-x*(x+16/5))/((5*x+6)*(5*x-4)) = 0
(-x*(x+16/5))/((5*x+6)*(5*x-4)) = 0 // * (5*x+6)*(5*x-4)
-x*(x+16/5) = 0
( -x )
-1*x = 0 // : -1
x = 0
( x+16/5 )
x+16/5 = 0 // - 16/5
x = -16/5
x in { 0, -16/5 }
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