How to use "不就行了" ?

So, in my 口语 book there's this construction - ' 。。。不就行了 '

I'm supposed to make some sentences with it, but i literally can't find a translation for it or any examples. I completely understand 就行了 and i can make some basic sentences with it, but the '不' is confusing the hell out of me, could be because i'm so sleep deprived but help me out here before i lose my mind.

Can anyone tell me the meaning and/or give me an example?

submitted by /u/superboredpanda
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