When solving these types of problems, follow BEDMAS.
B-Brackets. You always answer the equation in the brackets first.
E-Exponents. For instance, 3 to the power of 3 isn't the same as 3x3 because you're multiplying 3x3x3=27.
D-Division
M-Multiplcation. Division and multiplication go together. For example, 8x2 divided by 4. Even when you divvide 2 by 4 first, then multiply 8 by 2, it's the same product as doing it the other way around, but you must always answer from left to right when it comes to division and multiplication; and addtion and subtraction, but with brackets as an acception.
A-Addition
S-Subtraction *These go together!
Now, using BEDMAS, you can now answer the operation.
7+3x3
=7+9 (because 3x3=9)
=16
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