Sometimes a simple algebra move at the beginning of a math problem can change the level of difficulty dramatically.
There is no set of rules here, but just reminded yourself to stop and take a look at the problem first before you go rushing into it.
Here are just a couple of examples of what I mean. You will see that there is some personal preference in these choices.
Algebra: Look to Distribute
Less parentheses are usually better than more parentheses.
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