Factorise:
12a²xy - 3b² xy
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12a² - 9ab - ( 16a²-3b²+7ab)
12a² - 9ab - 16a² + 3b² - 7ab
(12a²-16a²) +(-9ab -7ab) + 3b²
-4a² -16ab +3b²
12a² -9ab is -4a² -16ab +3b² greater
than16a²-3b²+7ab
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