15. (7A)-¹ = -3 1 7 -2
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In Exercises 15–18, use the given information to find ?.
![15. (7A)-1
-3
1 -2](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbcabf4e2-d726-470f-ab0b-ceee8041df2c%2F6cf7f462-8623-47a2-8de0-d29769083818%2Fx5hzzrc_processed.png&w=3840&q=75)
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