from the sum of 9 X + 8 Y + 3 Z and 3 x-4 Y + 5 Z subtract the sum of 6 X + 7 Y - 2 Y and 2 x - 5 - 3 Z
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12x + 12y +8z - ( 8x + 5y - 5 - 3z )
12x + 12y +8z - 8x - 5y + 5 + 3z
answer = 4x + 7y +11z +5
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Why was copper a valuable commodity to the people of the UAE in Bronze Age times?
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