The age of a father is 2 less than 7 times the age of his son. In 3 years, the sum of their ages will be 52. If the son’s present age is s years, which equation models this situation?

The father is 40 which is 2 less than 7x6=42  Therefore the son is 6. In 3 years the the father will be 43 and the son will be 9.  43+9=52