PLEASE HELP - Arithmetic Sequences

Key, just in case there are varying letters used

U - unknown number

n - number you're looking for

d - common difference

Find the general term for Un for an arithmetic sequence given that:

U4=37 and U10 =67

I know how to do it up to here, but I don't know what to do next:

U10-U4=6d

--> U10-U4=67-37=30

6d=30

d=5

So I have the common difference but I don't know what to do with it now, even if I just insert it into the equation, I don't have the other values...

Un=U1+(n-1)d

Un=U1+(n-1)(5)