Apply the opposite equation
a+5=7 Step one, isolate the variable
-5 -5 Step two, apply the opposite integer
a=2
a+5=7 The third and final step is to check your answer.
2+5=7
7=7
Easy isn't it? Now that you've learned how to do this, try these questions:
1)b+3=5
2) c/3=7
3)4d=16
Stuck? Well, here are the answers!

(text book available here)
If I didn't help, please refer to these videos:
One Step Algebra Equations - Addition
or check this game out:
Thank you for reading my scribe! Please remember to comment below.