Add.(-9x7 - x4y3 + x3y4 + 3y7) + (18x7 -  x4y3 - 3x2y5 + 4xy6 - 2y7)

A. 9x7 + 2x4y3 + x3y4 + 3x2y5 - 4xy6 - y7
B. 9x7 + x3y4 - 3x2y5 + 4xy6 - y7
C. 9x7 - 2x4y3 + x3y4  + y7
D. 9x7 - 2x4y3 + x3y4 - 3x2y5 + 4xy6 + y7


Answer: D

Mathematics

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