5. If \( D \) is the midpoint of \( \overline{C E}, C D=9 x-7 \), and \( D E=3 x+17 \), find \( C E \).

Step 1 ：\( CD = DE \)

Step 2 ：\( 9x-7 = 3x+17 \)

Step 3 ：\( CE = 2(CD) \)