Add: (3x4 + x2 + 2) + (9x4 - x2 + x)
a. 12x8 + x + 2
b. 12x8 + x4 + x + 2
c. 27x4 - x2 + x + 2
d. 12x4 + x + 2

subtract: (3x2 - x - 5) - (x + 2)
a. 3x2 - x - 3
b. 3x2 - 2x -7
c. 3x2 - 3

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