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Marcus finds that (3x 2y +5x)+(4x +12y-7x) - 7x - 10y 2x What error...

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

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