I've retitled your thread according to what I think you're after here. Are you trying to find an equation for which x = 4 is the solution?
I was presented with 4 equations as possible solutions for x=4. The one below was the correct one but I converted 14/3 to the proper fraction 4-2/3. Then I added 2/3 + 4 = 4-2/3. I found the right equation that way but did I solve it the right way? Would this be acceptable on a test.
2/3 + x = 14/3