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ax + x² + 3ax + 3x -( ax + 2x² + a + 2x) -(2a - 2x)
ax + x² + 3ax + 3x -ax - 2x² - a - 2x - 2a + 2x
-x² + 3x + 3ax -3a
x² - 3x - 3ax +3a