2 answers:
31=2y-5
Add 5 on both -5+5 which cancels out and 31+5 which is 36 and then divide 36 by 2 which equals to 18.
So y=18 hope this helped (':
Hey!

First, this problem should be switch sides.

Secondly, add 5 from both sides of equation.

Then, simplify

In fact, you had to divide 2 from both sides of equation.

Finally, simplify

And the answer is 
I hope this helped!
Thank you for posting your question.
-Charlie
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