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  • 2x^2 + 3x - 5 บวก – 7x^2 + 1
    – 5x^ 2 + 3x - 4
  • 2x^2 + 3x - 5 ลบ – 7x^2 + 1
    9x ^2 + 3x - 6
  • 3x^2 - 2x + 6 บวก x ^2 + 7x + 3
    4x^2 + 5x + 9
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