We have
First, we can combine like terms 3y and -7y to get -4y.
Then, we have
We could then subtract 8 on both sides to get 
Finally, we isolate y completely by dividing both sides by -4, to get
First, we can combine like terms 3y and -7y to get -4y.
Then, we have
Finally, we isolate y completely by dividing both sides by -4, to get