3+[3.7+{2.9+(3.7-2.3)-0.4}]
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Answer:
3[3.7+{2.9+(1.4) -0. 4}]
3[3.7+{2.9+1.4-0.4}]
3[3.7+{3.9}]
3[3.7+3.9]
3×7.6
22.8
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