How to do recursion by hand?

I am having a brain lapse in recursion and trying to get the math right. The function gives me what I want but my brain does not.

let recurseSum = (x, n) => {
    if(n === 1){ return x}

    return x + recurseSum(x, n-1)
}

log = console.log
log(recurseSum(3, 2))

How is this broken down again, the answer and what I write is not right.

3 + recurse(3, (2-1) = 3 + 1 = 4
3 + resurse(3, (1-1) = 3....ggrrrrrrr

How do I write this out properly.