Question
How much less than x - 2y + 3z is 2x - 4y - z?
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Answer
= (x - 2y + 3z) - (2x - 4y - z)= x - 2y + 3z - 2x + 4y + z
= -x + 2y + 4z
= -x + 2y + 4z
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