Subtraction is not completed before multiplication (even when you see it first moving from left-to-right) unless it is inside a grouping.
This problem was tricky because you may not have recognized that there was multiplication.
Please copy this problem on your paper. If you don't spot the multiplication in this problem please ask for assistance. (HINT: The multiplication is indicated without using any multiplication sign!)
42 - 3(2 + 4) + 5 =
Order of Operations Automatic Flip-Through SLIDE SHOW
Overview of the Order of Operations
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