#### Answer

He didn't subtract -10 from both sides correctly.
The correct answer is $x=-1$

#### Work Step by Step

When you correctly subtract both sides by 10, you get $12x=-12$, which equals $x=-1$.

Published by
Prentice Hall

ISBN 10:
0133186024

ISBN 13:
978-0-13318-602-4

He didn't subtract -10 from both sides correctly.
The correct answer is $x=-1$

When you correctly subtract both sides by 10, you get $12x=-12$, which equals $x=-1$.

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