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Learning task 3. Solve the following. Show complete process.
1. From the sum of 3x³ + 7x² - 5 and 2x² + 3x + 8, take away 5x² + x - 5.
2. What should be added to 3x³ + 4x² - 7 to have a sum of 4x³ + x² + 5.​