Solve what is in parenthesis first (5-9) = -4
Solve exponents next -4^3 = -64
Divide next

= -32
Lastly, subtract and resolve the negatives which become a positive number 125 - (-32) = 125 + 32 = 157
Immediately, you can get rid of the 1/5x and -1/5x because they would cancel each other out which leaves you with:

From there you can subtract 2/3 from each side and get 7.
I still believe something is wrong with the equation since it still doesnt, make sense but since you swear that is the correct equation...