Answer:
CD = 40
Explanation:
Since D is the midpoint, the entire length CE is twice the length of CD, so we have ...
2×CD = CE
2×(5x) = 9x +8
x = 8 . . . . . . . . subtract 9x and simplify
Then the length of CD is ...
CD = 5x = 5·8 = 40
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