You need to use two properties:

- Opposite angles (useful for angle x)
- Exterior angle of a triangle (to understand the relationship between z and x+y)

Once you do this, try and simplify Quantity A by adding x to both Qa and Qb. You will be able to see the relationship between x, y, and z.

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Got it, thanks

I was calculating x = y + 180 - z, what I missed was 180 - x is = y + 180 - z

So that makes z - x = y

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