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I really need help on this last question i have from my hw, please help!

I really need help on this last question i have from my hw, please help!-example-1
User Williamson
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\measuredangle7=\measuredangle9=110
\measuredangle9+\measuredangle12=180
\measuredangle12=180-\measuredangle9
\measuredangle12=180-110=70

User Oleksii Masnyi
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