6. Simplify 2a -3b - [6a-8b-{7a - (9b-8a) -3b} l.
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Answer:
2a-3b-[6a-8b-{7a-(9b-8a)-3b}]
=2a-3b-[6a-8b-{7a-9b+8a-3b}]
=2a-3b-[6a-8b-{15a-12b}]
=2a-3b-[6a-8b-15a+12b]
=2a-3b-[-9a+4b]
=2a-3b+9a-4b
=11a-7b
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