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contestada

Which of the following expressions is equivalent to 31y - 14z - 3y - 12x + 7 - 3z?
A. 12x + 34 y + 17z + 7


B. 14y - 5x - 3z


C. 12x + 31y - 3z


D. -12x + 28y - 17z + 7