simplify [0.9{2.3-3.2-(7.1-5.4-3.5)}]
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[0.9{2.3-3.2-(7.1-5.4-3.5)}]
[0.9{2.3-3.2-(7.1-8.9)}]
[0.9{-0.9-(-1.8)}]
[0.9{0.9}]
0.81
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