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D( x )
5*x-2 = 0
7*x-6 = 0
5*x-2 = 0
5*x-2 = 0
5*x-2 = 0 // + 2
5*x = 2 // : 5
x = 2/5
7*x-6 = 0
7*x-6 = 0
7*x-6 = 0 // + 6
7*x = 6 // : 7
x = 6/7
x in (-oo:2/5) U (2/5:6/7) U (6/7:+oo)
6/(5*x-2) = 9/(7*x-6) // - 9/(7*x-6)
6/(5*x-2)-(9/(7*x-6)) = 0
6/(5*x-2)-9*(7*x-6)^-1 = 0
6/(5*x-2)-9/(7*x-6) = 0
(6*(7*x-6))/((5*x-2)*(7*x-6))+(-9*(5*x-2))/((5*x-2)*(7*x-6)) = 0
6*(7*x-6)-9*(5*x-2) = 0
-3*x-18 = 0
(-3*x-18)/((5*x-2)*(7*x-6)) = 0
(-3*x-18)/((5*x-2)*(7*x-6)) = 0 // * (5*x-2)*(7*x-6)
-3*x-18 = 0
-3*x-18 = 0 // + 18
-3*x = 18 // : -3
x = 18/(-3)
x = -6
x = -6
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