((12 - 1)/9 + 3·x)/(5/9 - 1) + 9·x = (x - 5)/2 - (2/9 - x)/(3/9 + 1) + 1 + 1/12·x
(3·x + 11/9)/(- 4/9) + 9·x = (x - 5)/2 - (2/9 - x)/(4/3) + 1 + 1/12·x
(3·x + 11/9)·(- 9/4) + 9·x = (x - 5)/2 - (2/9 - x)·(3/4) + 1 + 1/12·x
(- 27·x/4 - 11/4) + 9·x = (x - 5)/2 - (1/6 - 3·x/4) + 1 + 1/12·x
9·x/4 - 11/4 = (x/2 - 5/2) - (1/6 - 3·x/4) + 1 + 1/12·x
9·x/4 - 11/4 = 4·x/3 - 5/3
(9/4 - 4/3)·x = 11/4 - 5/3
11·x/12 = 13/12
x = 13/11