please help with this one!

What are you instructed to do? Let me know so I can give this thread a descriptive title, please. :)
 
Hi Neil. Assuming that you're supposed to combine the three algebraic ratios into a single ratio (i.e., simplify the expression, by doing the subtractions), then you'll need to get a common denominator first. If you'd like to get a single ratio, can you see what the common denominator needs to be?

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