Ernesto loses 14.5 lbs in 7 months. Now he weighs 156.5 lbs. which equation can be used to find how much he weighed before?
156.5 lbs + 14.5 lbs = x
x = 171 lbs
I think more in the spirit of the question,
x - 14.5 = 156.5
x = 171 lbs
x - 14.5 = 156.5