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musiclover10045

The two angles are supplementary angles which means they need to equal 180 degrees when added together.

4x + x = 180

5x = 180

Divide both sides by 5:

x = 180/5

x = 36

pitchoune11

Both angles are additional angles.

4x + x = 180

5x = 180

Divide both sides by 5:

x = 180/5

x = 36

Check the 3