from the sum of 11a3 -- 3b2 and 4a3 +6b2 subtract the sum of 9a3 + b2 and 3a3 - 4b2 .
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Step-by-step explanation:
11a3 - 3b2 +4a3 +6b2
=15a3 + 3b2
9a3 + b2 + 3a3 - 4b2
12a3 - 3b2
15a3 + 3b2- 12a3 + 3b2
3a3 + 6b2
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