Parentheses.
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the order of operations
If you change the order of operations, you will get a different result. The person who wrote the expression had a specific order of operations in mind (using generally-accepted rules), so arbitrarily using some other order of operations is, quite simply, wrong.
When evaluating an expression, do these in this order:work out what is inside any parentheses firstnext, do exponentsmultiplication and division are done in the order you see them, from left to right.addition and subtraction are done in the order you see them, from left to right.
In alphabetical order, "rain" comes before "rainbow." This is because the letter "i" in "rain" appears before the letter "b" in "rainbow." Therefore, rain is listed first.