Add some brackets to the following formula, so that the result of the formula is an integer and as small as possible. How to add brackets? 10 ﹣ 9 ﹣ 8 ﹣ 7 ﹣ 6 ﹣ 5 ﹣ 4 ﹣ 3

10÷9÷（8÷7÷6）÷（5÷4÷3）
=10/9÷【8÷（7*6）】÷【5÷（4×3）】
=10/9÷8/42÷5/12
=10/9*42/8*12/5
=42

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