Subtract 3x - 4y - 7z from the sum of 2x - 3y + z and -3x + 8y - 10z
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2x-3y+z+(-3x)+8y-10z
2x-3x-3y+8y+z-10z
-x+5y-9z
-x+5y-9z-3x-4y-7z
-x-3x+5y-4y-9z-7z
-4x+y-16z
$o The answer to your question is 4x+y-16z
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