You can put this solution on YOUR website! Actually, with order of operations, no parentheses are needed.
9 + 6 · 2 ÷ 3 - 1 <--multiply or divide first starting from left to right
9 + 12 ÷ 3 - 1 <--multiply or divide first starting from left to right
9 + 4 - 1 <--add or subtract starting from left to right
13 - 1 <--add or subtract starting from left to right
12