Find the sum: (2x7 + x5 - 3x3 + 12x) + (3x6 - 5x4 - 3x2 + 20).
A. 2x6 - 3x4 - 2x3 - x2 + 20x
B. 4x7 + x6 - 2x5 + 2x4 - 5x3 - x2 + 17x + 20
C. 2x7 + 3x6 + x5 - 5x4 - 3x3 - 3x2 + 17x + 20
D. 2x7 + 3x6 + x5 - 5x4 - 3x3 - 3x2 + 12x + 20
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