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You can use them to find a variable.

Lets say you have two equivalent expressions with the same variable...

x + 2x - 42 = 0

2x - 28 = 0

If you combine these equivalent expressions you ahve...

x + 2x - 42 = 2x - 28

In all of the expressions you have x = 7

There are also other applications but its confusing to explain.

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Q: How are equivalent expressions used?
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