Help with challange

Tell us what’s happening:
Honestly, I can't get through with this challenge, it keeps saying " Once both functions have ran, the sum should be equal to 8" how can I do that? I tried adding both functions together and nothing. I tried creating another variable and adding both function it is still nothing. I don't understand where I went wrong

Your code so far

// Example
var sum = 0;
function addThree() {
sum = sum + 3;

// Only change code below this line
function addFive(){
var sum = sum + 5;

// Only change code above this line

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User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36.

Challenge: Understanding Undefined Value returned from a Function

Link to the challenge:

declaring the variable with var inside the function you are creating a local variable, so you are not changing the global variable

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That actually made perfect sense when I looked at it again, thank you.

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