1)9/x-9=1. 2)11/x-5=5/x-11. 3)7/x-15=15/x-7. 4)1/(x+6)+1/x-1=0. 5)1/(x+9)+1/x-9=0 !

9 - 9x = x
9 = 10x
x = 9/10

11 - 5x = 5 - 11x
6x = -6
x = -1

7 - 15x = 15 - 7x
-8 = 8x
x = -1

x - 1 + x + 6/(x-1)(x+6) = 0
2x + 5/(x-1)(x+6) = 0
x не равен 1, -6
2x + 5 = 0
x = -2.5

x - 9 + x + 9/(x-9)(x+9)
x = 0