6x-8+9=x+(x+9)/3

6x-8+9=x+(x+9)/3  subtract x from both sides

5x - 8 + 9  = (x + 9)/3     simplify the left side

5x + 1  = (x + 9)/3      multiply both sides by 3

15x + 3  = x + 9        subtract x , 3 from both sides

14x = 6    divide both sides by 14

x = 6/14 =  3/7