Question
By how much should x + 2y – 3z be increased to get 3x?
✓
Answer
3x – (x + 2y – 3z)
= 3x – x – 2y + 3z
= 2x – 2y + 3z
= 3x – x – 2y + 3z
= 2x – 2y + 3z
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