Question 13383
To solve using the order of operations, you first do parentheses (do the innermost parentheses first).  This will change your equation to {{{5-3(4-7)-9}}}.  Then, do the next set of parentheses to get {{{5-3(-3)-9}}}.  The next step of order of operations is multiplication/division, which is found in the 3*-3...this gives you {{{5+9-9}}}.  Then, you add/subtract from left to right to get 5.