Add.-4x7 - x4y3 + x3y4 + 7y7 and 8x7 - x4y3 - 7x2y5 + 9xy6 - 6y7
A. 4x7 - 2x4y3 + x3y4 + y7
B. 4x7 + x3y4 - 7x2y5 + 9xy6 - y7
C. 4x7 + 2x4y3 + x3y4 + 7x2y5 - 9xy6 - y7
D. 4x7 - 2x4y3 + x3y4 - 7x2y5 + 9xy6 + y7
Answer: D
Mathematics
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