5a-[3b-{4a-(5b-6a-7b)}]
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Answer:
15a-b
Step-by-step explanation:
5a-[3b-{4a-5b+6a+7b}]
5a-[3b-{4a-5b+6a+7b}]5a-[3b-4a+5b-6a-7b}]
5a-[3b-{4a-5b+6a+7b}]5a-[3b-4a+5b-6a-7b}]5a-3b+4a-5b+6a+7b
5a-[3b-{4a-5b+6a+7b}]5a-[3b-4a+5b-6a-7b}]5a-3b+4a-5b+6a+7b= 5a+4a+6a-3b-5b+7b
5a-[3b-{4a-5b+6a+7b}]5a-[3b-4a+5b-6a-7b}]5a-3b+4a-5b+6a+7b= 5a+4a+6a-3b-5b+7b= 15a-b
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