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{{ printedBook.courseTrack.name }} {{ printedBook.name }} When rewriting equations it's important to make the **the same operation on both sides** to ensure that the equality still holds. So, if a number is added to one side, the same number must be added to the other side. In the equation $4x−7=5,$ $7$ can be added to both sides.
$4x−7+7=5+7⇔4x=12$