Seven years ago, the son's age would have been x - 7 and the father's age would have been (x + 20) - 7 = x + 13.
The sum of their ages seven years ago would be (x - 7) + (x + 13) = 2x + 6.
However, we don't know the current ages of the son and the father, so we can't solve for 2x + 6.
If a father is 20 years older than his son. What is the sum of their age seven years ago? Hints: Let the son's age be x and the father's age be x + 20.
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