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x²- ab + ab - b -b² - 3a²
= x² -b-b² - 3a²
= -3a² - b² - x² - b
(b² +ab -3a²) -(x² -ab -b)
b² +ab -3a² -x² +ab +b
b² +ab +ab -3a² -x² +b
b² +2ab -3a² -x² +b