You didn't include a question.
But I am going to make some assumptions here.
Let P = the weight of a bag of pasta.
The equation would be:
60 = 4P + 7
Solve for P to see how much one bag of pasta weighs.
53 = 4P
Divide both sides by 4.
53/4 = P
13.25 = P
A bag of pasta weighs 13.25 lbs.