I have a twelve year old and sometimes his work takes a lot of explination for him to understand.Have you tried looking online for help?
I can try to explain it to you.
10x -16=5x +4
You need to try and make each side the same,so for example if each x = 4 that would mean
10x is 40,take away the 16=24
Then on the other side,
5x would be 20,add the 4=24.
So for each side to be 24,x would equal 4.
At least thats how I would do it x