Add.(x3y2 + 5x2y3 - 2xy - 3) + (x2y3 + 7x3y2 + 5xy + 4)
A. 8x3y2 + 6x2y3 - 2xy + 1
B. 6x3y2 + 6x2y3 + 3xy + 1
C. 8x3y2 + 6x2y3 + 3xy + 1
D. 2x3y2 + 12x2y3 + 3xy + 1
Answer: C
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