1.Subtract (-6b) + c + a and (-3a) + 2c + 3b from the sum of 5a – 8b +2c and 3c -4b -2a.
2. What should be subtracted from 3x² - 4y² - 5z² - 6 to get 4x² + 5y² - 6z² + 7?
3. Simplify: {7 – 2x + 3y – (3x – y)} - {2x – 5y + 11}"
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