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If x=5 , then x+7 = 5+7 .

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1 Answer

It is already done.  Here is how it is done (and usually presented):
 
Basically you have a relationship  x+7=y.
The problem asks " If x = 5, what is y?"
 
Do the problem by substituting the value 5 for x in the original equation, ie:
x+7=y
5+7=12=y.
This fundamental algebra.