add 3 x^2 + 5 _ 3 + 7 x^2 - 2x + 7
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3x^2 +5x -3 +7x^2 -2x +7
3x^3 + 7x^2 +5x -2x -3 +7
= 10x^2 +3x +4
answer.....,
3x^3 + 7x^2 +5x -2x -3 +7
= 10x^2 +3x +4
answer.....,
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