Add or subtract as indicated.(-7 - 2x7 + 8x9 - 5x8) + (-9x8 - 6x7 - 2 + 7x9)
A. -7x48 - 9
B. -16x9 - 16x8 + 6x7 + 2
C. 15x18 - 14x16 - 8x14 - 9
D. 15x9 - 14x8 - 8x7 - 9
Answer: D
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