Subtract.(-15z + 9z7 + 3z6) - (15z6 + 6z7 - 8z)

A. 3z7 - 12z6 - 23z
B. 3z7 + 9z6 - 23z
C. -16z14
D. 3z7 - 12z6 - 7z

Answer: D

Mathematics

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