The equation 2X + 1 = 7 is a simple linear equation in one variable, where X represents an unknown value. To solve for X, we need to isolate it on one side of the equation. This involves performing operations that maintain the equality. First, we subtract 1 from both sides, resulting in 2X = 6. Next, we divide both sides by 2 to find X = 3. Thus, the solution to the equation is X = 3, meaning that when X is 3, the original equation holds true.