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Example: x − 2 = 4

When we put 6 in place of x we get:

6 − 2 = 4

which is true

So x = 6 is a solution.

How about other values for x ?

For x=5 we get "5−2=4" which is not true, so x=5 is not a solution.For x=9 we get "9−2=4" which is not true, so x=9 is not a solution.etc

In this case x = 6 is the only solution

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