How to solve u/5+3=1

First subtract 3: u/5 = - 2

Now, because u is divided by 5, we can multiply by 5 to get u on its own.

u = - 10

To check, - 10/5 + 3 = 1

-2 + 3 = 1

1 = 1

This leaves us with a true statement, so the answer is correct.