Opposite of -5.23 should be 5.23
I'm not gonna prove the formula, but here's the solution. Notice how the degree cancel each other out.
You can use cubes to help you write an expression and model the problem by using the cubes in replace of numbers. It should be a lot easier. Then after you finish you just have to write it down. There are other ways, but this is just one.
27/40, nothing divided evenly between the two.