1. The problem asks to explain the concept of "the first" which might mean the first step or fundamental idea in a math context. 2. Without additional specifics, one common interpretation is "the first element" or "the first step in solving a problem". 3. If referring to the first element of a sequence, it is simply the element at position one, denoted as $a_1$. 4. If referring to the first step in solving an algebra equation, it usually involves isolating the variable or simplifying the equation. 5. Please specify the exact context or provide the exact problem for a more precise explanation.