Question 19368
-4 = 2/3x+9+1/3x
2/3x + 1/3x = 1x   
9 + 1 = 10
-4 = 1x+10.....your simple problem
-10    -10.....subtarct 10 from both sides
-14 = 1x
1x is the same as x so your answer is -14=x