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x4-{-4x3 - 6x2+ 4x -1} -x4 - 6x2 -8
x4 + 4x3 + 6x2 - 4x +1 -x4 - 6x2 -8
(x4 - x4) + 4x3 +(6x2 - 6x2) -4x + (1-8)
4x3-4x-7