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5x^2 + 6x + 9 + (?) = -x^2 +3x + 3

(?) = -5x^2 -6x - 9 -x^2 +3x + 3 = -6x^2 -3x -6

Ans: -6x squared +3x -6

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Q: What must be added to 5 x squred plus 6x plus 9 so that the sum is negative x squered plus 3x plus 3?
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