5a^2-7ab+5b^2 from 3ab-2a^2-2b^2
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= 3ab - 2a² - 2b² - 5a² - 7ab + 5b²
= 3ab - 7ab + 5b² - 2b² - 5a²- 2a²
= - 4 ab - 7a² + 3b²
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