Five years ago a man was seven times as old as his son. Five years hence, the father will be three times as old as his son. Find their present ages.

Explanation

To find the present ages of the father and son based on the given conditions, we can set up a system of equations. Let's go through the solution step by step.

### Step 1: Define the Variables
Let:
- \( X \) = present age of the father
- \( Y \) = present age of the son

### Step 2: Set Up the First Equation
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