subtract 4x² - z² from the sum of 2x² + 3y² - 4z² and x² - 2y² and z²
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2x² + 3y² - 4z² + x² - 2y² + z² - ( 4x² - z² )
2x² + 3y² - 4z² + x² - 2y² + z² - 4x² + z²
2x² - 4x² + x² + 3y² - 2y² - 4z² + z² + z²
- x² + y² - 2z²
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