The sum of 5 and a number x
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The sum of 5 and a number x is 5+x
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The answer depends on the value of x.
If x=4 then the answer is 9.
if x=0 then the answer is 5.
As you can see there is no single answer to your question. In this case the mathematicians simply write the sum of x and 5 is „x+5“
This short notation „x+5“ means: whenever you throw a number at me (let‘s call this number x) I can give you the answer by adding 5 to it.
x varies, this is the reason why x is called variable. 5 is a constant.
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