Delete the BOOTTOPRO="" and IPADDR="" lines.I came to this thread with the same problem. Initially, I had added the BOOTTOPRO and IPPADDR lines to set static values for enp0s3. After deleting these two lines, I was able to do systemctl restart network.service
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Answer by user3638494 for network.service Failed to start LSB: Bring up/down networking - Centos 7
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