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D( x )
3*x-5 = 0
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:+oo)
(5*x)/(3*x-5) = 9 // - 9
(5*x)/(3*x-5)-9 = 0
(5*x)/(3*x-5)+(-9*(3*x-5))/(3*x-5) = 0
5*x-9*(3*x-5) = 0
45-22*x = 0
(45-22*x)/(3*x-5) = 0
(45-22*x)/(3*x-5) = 0 // * 3*x-5
45-22*x = 0
45-22*x = 0 // - 45
-22*x = -45 // : -22
x = -45/(-22)
x = 45/22
x = 45/22
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