There is a balanced binary tree, now add 2 new nodes into how to ensure balance?

there is a balanced binary tree. How to ensure balance by adding 2 new nodes?

for example, the weights are as follows: 100, 92, 86, 56, 6, 10, 90 , how to build a balanced binary tree?

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e4783f-44c53.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e4783f-44c53.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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