Below I have put some things of what I have learnt.
When Variables are the same they are called Like Terms!
2a+5a+=7a
4c+5c=9c
7p-4p=3p
ab+2ab=3ab
2a+4c+5c+5a=7a+9c
2f+2g+4f+7g= 6f+9g=15fg
2a+3a2+4a=9a+6a=15a
**Letters must be in alphabetical order.
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