$3+3 \times 3-3+3=$

Step 1 ：First, we need to follow the order of operations (PEMDAS/BODMAS) to solve this expression. So, we'll perform the multiplication, then addition and subtraction from left to right.

Step 2 ：\(3+3 \times 3-3+3\)

Step 3 ：\(3+9-3+3\)

Step 4 ：\(12-3+3\)

Step 5 ：\(9+3\)

Step 6 ：\(\boxed{12}\)