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Need help understanding!!!!

Need help understanding!!!!-example-1

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Answer:

Explanation:

The two angles are formed from 2 intersecting lines. The angles are called vertically opposite angles. They are equal

4x + 21 = 85 Subtract 21

4x = 85 - 21 Combine

4x = 64 Divide by 4

x = 64/4

x = 16

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