A+4=10
6+4=10
10=10
Use reverse order of operation, what you do the first one, you have to do to the other. (As you can see when we used reverse order of operation the first time, we also did the same at the end)

Here are some other practices we did:

CHECK:
B-2=5
7-2=5
5=5

CHECK:
3c=21
3x7=21
c=7

CHECK:
2j+1=9
2(4)+1=9
8+1=9
9=9

CHECK:
f÷3-2=1
9÷3-2=1
3-2=1
1=1
Here is a LINK where you can practice with algebra.
Here is also a VIDEO about equations.
*I was having trouble with the video, so just click the link and you will get to it! :)