Perform the indicated operations

10 − 5[24 ÷ 6 ⋅ 2] 1

10 - 5(24/6 * 2) 1 = 10 - 5(4*2) = 10-5(8) = 10-40 = -30

Anything times 1 (at the end of your formula) = that value. Do you have a typo?