(9 + 8x2 + 9x4 - 7x3)
+ (-2x3 + 2x2 + 2 + 5x4)
(9 + 8x2 + 9x4 - 7x3) + (-2x3 + 2x2 + 2 + 5x4)
11+10 x2 -9 x3+14 x4
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