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8x + 4x -8x^2 +8x -11x
-8x^2 - 9x
8x + 4 x - 8x ^2 + 8x - 11x =
8x + 4x - 8x`^2 + 8x - 11x =
8x + 4x + 8x - 11x - 8x`^2 =
9x - 8x^2