3 - [{(5 by 18 ÷ 1 by 2 ) + 18 by 21 - 6 by 7 } of 3 by 5 - 7
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- [{(5 by 18 ÷ 1 by 2 ) + 18 by 21 - 6 by 7 } of 3 by 5 - 7
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