In expressions with several operations, the result depends on the order of evaluation.
Rules for natural numbers:
1) first, operations inside parentheses;
2) then multiplication and division (left to right);
3) then addition and subtraction (left to right).
If the expression has only one level of operations (for example, only + and −), compute left to right. Parentheses are used to change the order explicitly and make the expression unambiguous.
Parentheses have priority
First ×,÷, then +,−
Same priority — left to right
Parentheses can change the result
Multiplication first, then addition
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