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D( x )
5*x+4 = 0
5*x+4 = 0
5*x+4 = 0
5*x+4 = 0 // - 4
5*x = -4 // : 5
x = -4/5
x in (-oo:-4/5) U (-4/5:+oo)
(5*x-4)/(5*x+4) = 2/3 // - 2/3
(5*x-4)/(5*x+4)-(2/3) = 0
(5*x-4)/(5*x+4)-2/3 = 0
(3*(5*x-4))/(3*(5*x+4))+(-2*(5*x+4))/(3*(5*x+4)) = 0
3*(5*x-4)-2*(5*x+4) = 0
5*x-20 = 0
(5*x-20)/(3*(5*x+4)) = 0
(5*x-20)/(3*(5*x+4)) = 0 // * 3*(5*x+4)
5*x-20 = 0
5*x-20 = 0 // + 20
5*x = 20 // : 5
x = 20/5
x = 4
x = 4
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