#### Answer

Substitution property of equality

#### Work Step by Step

x + x = 2x
Because they are equal, 2x can replace x + x.
x + x = 12
2x = 12

Published by
Cengage

ISBN 10:
978-1-337-61408-5

ISBN 13:
978-1-33761-408-5

Substitution property of equality

x + x = 2x
Because they are equal, 2x can replace x + x.
x + x = 12
2x = 12

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