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Answer:
16a-6b
Explanation:
2(a-3b)=2a-6b
2a-6b+2a-6b=4a-12b
3(2a+b)=6a+3b
6a+3b+6a+3b=12a+6b
4a-12b+12a+6b=16a-6b
perimeter= 16a-6b
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