evolute (3-1×4-1)÷(1/2)-1
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( 3 - 1 × 4 - 1 ) ÷ ( 1 / 2 ) - 1
3 - 4 - 1 / ½ - 1
- 1 - 1 / ½ - 1
- 2 / ½ - 1
- 2 × 2 - 1
- 4 - 1
- 5
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