#### Answer

51°

#### Work Step by Step

1. Vertical angles are congruent
5x -129 = 2x -21
2. Solve the equation to find x:
5x-2x= 129-21
3x=108
x=36
3. Plug x into one of the angles to find the angle itself:
5(36)-129= 51

Published by
Pearson

ISBN 10:
978-0-13-421743-7

ISBN 13:
978-0-13421-743-7

51°

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