The problem
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why does -38 in third line become +38
Answer provided by our tutors
We need to get rid of expression parentheses.
If there is a negative sign in front of it, each term within the expression changes sign.
Otherwise, the expression remains unchanged.
In our example, the following 2 terms will change sign: 2y and -38:
Keep in mind that Y\you can obtain an explanation for any step by clicking on it. Please note that you cannot click on the very first expression, which is the original problem. Quite often, several transformations will be performed within the same step. Use the explanation navigation buttons to step through all of them:
