-a -[a + {a + b - 2a-(a-2b)} - b]
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Answer:
-a - [ a +{ a+b-2a-(a - 2b)}-b]
= -a-[a+{a+b-2a-a+2b}-b]
= -a-[a+3b-2a-b]
= - a-(2b-a)
= - a-2b+a
= - 2b
Step-by-step explanation:
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