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Marcus finds that (3x^2-2y^2+5x)+(4x^2+12y-7x)= 7x^2-10y^2-2x What error did Marcus make? A: He combined the terms 5x and –7x incorrectly. B: He combined the terms 3x^2 and 4x^2 incorrectly. C: He combined the terms –2y^2 and 12y^2 incorrectly. D: He subtracted the polynomials instead of adding.


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