Solve the Equation: Finding the Missing Number in ? - 4.3 = 8.2

To solve the equation $? - 4.3 = 8.2$, we will isolate the variable $?$.

• Step 1: Add 4.3 to both sides of the equation to eliminate the subtraction from the left-hand side:

$\begin{aligned} ? - 4.3 + 4.3 &= 8.2 + 4.3 \\ ? &= 12.5 \end{aligned}$

Therefore, the solution to the problem is $\boxed{12.5}$.