+118608 Thanks Tertre, that is a good response.
I would word it just a little differently. I'd say
If you change one side you must do the SAME to the other side
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Here is a full answer from me: (of course I know people do not have time to give full answers very often)
I will do another similar question and then you can try your own one:
18=2+6+2t
First you must simplify both sides - if it is possible.
that gives
18= 8 +2t
you can swap sides if you want to
8+2t=18
2t+8=18
Now you must keep the equation balanced. Just like old fasioned see-saw style scales.
I used a t but the picture uses an x, it makes no difference.
2t+8=18
If you change one side you must do the SAME to the other side
You want the 2 lots of t all by itself so you must get rid of 8 on the right hand side.
You can do this by subtracting 8 from BOTH sides.
2t+8=18
2t+8-8=18-8
2t=10
Now if you divide 2t by 2 you get t on its own BUT if you divide the LHS by 2 you must also divide the RHS by 2
A fraction line is the same as a divide.
\(\frac{2t}{2}=\frac{10}{2}\\ t=5\)
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Now try your question and let us know how you go. We can check your answer for you if you want. 
