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2a+4a-b-{-[-4a+b-a+b-a]}
2a+4a-b-{+4a-b+a-b+a}
6a-b-4a+b-a+b-a
6a-4a-a+b-a-b+b
b
2a-(-4a+b)-{+4a-b+a-b+a}=
2a-(-4a+b)-4a+b-a+b-a=
2a+4a-b-4a+b-a+b-a=6a-4a-a-a+b=b
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