This is an order of operation question.
My Dear Aunt Sally.
Multiplication and Division are done first
Addition and Subtraction are done second.
Otherwise work from left to right.
3 + 7 - 7 + 3 - 3 x 3
3 + 7 - 7 + 3 - 9
Now just combine from left to right.
3 + 7 - 7 + 3 - 3 × 3
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