simplify in a easy method
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7 1 - [ 2 1 + { 1 1 - 1 { 3 - 1 - 1 )}]
2 4 4 2 2 3 6
15/2 - [9/2 ÷ {5/4 - 1/2 ( 9/6 - 2/6 - 1/6)}]
15/2 - [9/2 ÷ {5/4 - 2/4 ( 1)}]
15/2 - [9/2 ÷ {5/4 - 2/4 }]
15/2 - [9/4 ÷ {3/4 }]
15/2 - [9/4 x 4/3 }
15/2 - 3
15/2 - 6/2
9/2 or 4 1/2 or 4.5
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