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D( x )
5*x+6 = 0
3*x-7 = 0
5*x+6 = 0
5*x+6 = 0
5*x+6 = 0 // - 6
5*x = -6 // : 5
x = -6/5
3*x-7 = 0
3*x-7 = 0
3*x-7 = 0 // + 7
3*x = 7 // : 3
x = 7/3
x in (-oo:-6/5) U (-6/5:7/3) U (7/3:+oo)
2/(3*x-7) = 9/(5*x+6) // - 9/(5*x+6)
2/(3*x-7)-(9/(5*x+6)) = 0
2/(3*x-7)-9*(5*x+6)^-1 = 0
2/(3*x-7)-9/(5*x+6) = 0
(2*(5*x+6))/((3*x-7)*(5*x+6))+(-9*(3*x-7))/((3*x-7)*(5*x+6)) = 0
2*(5*x+6)-9*(3*x-7) = 0
75-17*x = 0
(75-17*x)/((3*x-7)*(5*x+6)) = 0
(75-17*x)/((3*x-7)*(5*x+6)) = 0 // * (3*x-7)*(5*x+6)
75-17*x = 0
75-17*x = 0 // - 75
-17*x = -75 // : -17
x = -75/(-17)
x = 75/17
x = 75/17
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