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D( x )
5*x-3 = 0
5*x-3 = 0
5*x-3 = 0
5*x-3 = 0 // + 3
5*x = 3 // : 5
x = 3/5
x in (-oo:3/5) U (3/5:+oo)
(17*x-8)/(5*x-3) = 4 // - 4
(17*x-8)/(5*x-3)-4 = 0
(17*x-8)/(5*x-3)+(-4*(5*x-3))/(5*x-3) = 0
17*x-4*(5*x-3)-8 = 0
4-3*x = 0
(4-3*x)/(5*x-3) = 0
(4-3*x)/(5*x-3) = 0 // * 5*x-3
4-3*x = 0
4-3*x = 0 // - 4
-3*x = -4 // : -3
x = -4/(-3)
x = 4/3
x = 4/3
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