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Marcus finds that (3x-2y+5x)+(4x+12y-7x)-7x2-10y2-2x. What error did Marcus make? O He combined the terms 5x and -7x incorrectly. O He combined the terms 3x

Marcus finds that (3x-2y+5x)+(4x+12y-7x)-7x2-10y2-2x. What error did Marcus make? O He combined the terms 5x and -7x incorrectly. O He combined the terms 3x and 4x incorrectly. O He combined the terms -2y and 12y incorrectly. O He subtracted the polynomials instead of adding.

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