Simplify a-[2ь-{30. - (2b-31c)}]
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a-[2b -{30-(2b-31c)}]
a-[2b-{30-2b+31c}]
a-[2b-30+2b-31c]
a-[4b -30 -31c]
a-4b+30+31c
a-4b+31c+30
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