Problem
Gabrielle is 7 years younger than Mikhail. The sum of their ages is 65. What is Mikhail's age? years old
Solution
Step 1 ：Let Gabrielle's age be \(g\) and Mikhail's age be \(m\).
Step 2 ：Formulate the system of equations: \(g = m - 7\) and \(g + m = 65\).
Step 3 ：Substitute the first equation into the second, then solve for \(m\): \((m - 7) + m = 65\).
