Multiple VLANS connected to Server Without Default gateway ???

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Hi
I have a serious problem Here, pls check the image. I have more than 20 vlans running 172.16.x.x/24 Subnets
I also have branches operating at 10.0.0.0 subnets.
I need both to operate on my server.
I can give only one default gateway
Pls tell me the best solution for this program. What IP address range should I give for servers.
Pls reply ASAP