a-[a+{a+b-(2a-a-2b)}]
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a-[a+{a+b-(2a-a-2b)}]
a-[a+{a+b-(a-2b)}]
a-[a+{a+b-a+2b}]
a-[a+{3b}]
a-[a+3b]
a-a-3b
3b
a-[a+{a+b-(a-2b)}]
a-[a+{a+b-a+2b}]
a-[a+{3b}]
a-[a+3b]
a-a-3b
3b
Answered by
0
a-[a+{a+b-(2a-a-2b)}]
=a-[a+a+b-2a+a+2b]
=a-a-a-b+2a-a-2b
=-a+2a-b-2b
= a-3b
I hope,this is right answer.
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