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Theory

Addition Property of Equality

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

4 x - 7 = 5,

7

can be added to both sides.

4 x - 7 + 7 = 5 + 7 \Leftrightarrow 4 x = 12

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