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♫ :::::::::::::::::::::::::::::: // Hello There ! //  :::::::::::::::::::::::::::::: ♫

➷  The rule you need to know for this is:

vertically opposite angles are equal

From this, we can form an equation:

2x + 10 = 86 + x

- x from both sides

x + 10 = 86

-10 from both sides

x = 76

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➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

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