I believe this question should be a multiple choice question as there are numerous solutions.
Some of these solutions are:
4/3x+ 4 2/3 = 4/3x+ 8/3
4/3x+ 4 2/3 = 8/6x+ 4 4/6
4/3x+ 4 2/3 = 12/9x + 4 2/3
This can be explained as:
For 8/6x+ 4 4/6, divide the numerator by 2 and the denominator by 2 in each of the terms, the output will be the original expression.
For 12/9x + 4 2/3 , divide the numerator by 3 and the denominator by 3 in the first term (12/9x), the result will be the original expression.
