Answer:
You use the Order of Operations.
Explanation:
First do all function in parenthesis from left to right. Then multiplication and division from left to right, whichever comes first. Then addition and subtraction from left to right, whichever comes first.
Example: 6 - (5-3) + 10 x ( 2+1) =
6 - 2 + 10 x 3 =
6 - 2 + 30 =
4 + 30 =
34