12. How much is a + 2b - 3c greater than 2a - 3b + c?
13. How much less than x - 2y + 3z is 2x – 4y - Z?
By how much does 3x - 5x + 6 exceed x - x + 4x - 1?
15. Subtract the sum of 5x – 4y +62 and 8x + y - 2z from the sum of 12x - y + 3% and
16. By how much is 2x – 3y + 4z greater than 2x + 5y - 6z + 2?
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