The first step is to let b 2 = a and let -2/b = b
The second step is in put values so you get 7C3 a4b 3
The Third step would be to substitute the original values back in to the question.
The fourth and final step would be to solve the rest algebraically.
If you want to see a visual of how it is suppose to work out there is an image below for the answer.
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