SOLUTION: When solving an equation, do we need to keep the value of any one side of the equation unchanged? Why?

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Question 368981: When solving an equation, do we need to keep the value of any one side of the equation unchanged? Why?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Not necessarily. For example, even simple linear equations can require changes to both sides, as in
3x - 5 = 5x + 7