The equation 2x + 3 = 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, such as subtracting 3 from both sides. After subtracting 3, the equation becomes 2x = 4. Next, we divide both sides by 2 to find the value of x. This results in x = 2, which is the solution to the equation.