Subject: \[ \begin{array}{c} x+2 y=3 \\ x=? \end{array} \]

Step 1 ：Given the equation \(x + 2y = 3\), we are asked to solve for \(x\).

Step 2 ：Since we don't have a specific value for \(y\), we can't solve for a specific value of \(x\). However, we can express \(x\) in terms of \(y\).

Step 3 ：Rearranging the equation, we subtract \(2y\) from both sides to isolate \(x\).

Step 4 ：This gives us the equation \(x = 3 - 2y\).

Step 5 ：\(\boxed{x = 3 - 2y}\) is the final answer.