What does x equal when the problem is 1+x/3=5?

What is the perimeter of trapezoid jklm? + units 2 + + units 9 + units 9 + + units

How do you solve a question like this?

You have 12 balloons to blow up for your birthday party. you blow up 1/3, and your friend blows up 5 of them. what fraction of the baloons still need blowing up