please answer this please
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Step-by-step explanation:
=11a² + 5a -9b² — (6a² + 3a +4b²)
= 11a² + 5a -9b² -6a² + 3a +4b²
= 11a² -6a² + 5a -3a -9b² -4b²
= +5a² + 2a -13b²
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