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D( x )
5-(3*x) = 0
5-(3*x) = 0
5-(3*x) = 0
5-3*x = 0
5-3*x = 0 // - 5
-3*x = -5 // : -3
x = -5/(-3)
x = 5/3
x in (-oo:5/3) U (5/3:+oo)
(7*x-2)/(5-(3*x)) = 2 // - 2
(7*x-2)/(5-(3*x))-2 = 0
(7*x-2)/(5-3*x)-2 = 0
(7*x-2)/(5-3*x)+(-2*(5-3*x))/(5-3*x) = 0
7*x-2*(5-3*x)-2 = 0
13*x-12 = 0
(13*x-12)/(5-3*x) = 0
(13*x-12)/(5-3*x) = 0 // * 5-3*x
13*x-12 = 0
13*x-12 = 0 // + 12
13*x = 12 // : 13
x = 12/13
x = 12/13
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