Multiple IPs on NICs

hello guys, I have multiple private IPs on 3 NICs and each private IP is mapped to a public IP.

How to configure the system to select the public IP that will go out to the internet?

What I mean is:

NIC 1 - 2.2.2.2

NIC 2 - 3.3.3.3

NIC 3 - 5.5.5.5

So when I go to bing.com and type what's my public IP, the IP address that will be shown is: 5.5.5.5

any ideas how to do it?

Thanks.

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