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Dear Student, 
your question is unclear and appears to be incomplete. Recheck your question and please be little specific about the exact statement to which you are referring here so that we can provide you with some meaningful help. 

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But the information provided in the figure means
As, we know that,
the sum of angles around a point = 360⁰
So, x + y + z + 150⁰ = 360⁰
       x + y + z = 360⁰ - 150⁰
        x + y + z = 210⁰

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Regards!