Diagram NOT accurately drawn $$\(A, D, B\)$$ and $$\(E\)$$ are points on a circle, centre $$\(O\)$$. $$\(A F B C, O E C\)$$ and $$\(O F D\)$$ are straight lines. $$\(A F=7 \mathrm{~cm}, F B=4 \mathrm{~cm}, B C=5 \mathrm{~cm}, F D=2 \mathrm{~cm}\)$$ and $$\(C E=x \mathrm{~cm}\)$$. Work out the value of $$\(x\)$$. Show your working clearly. $$\(x=\)$$

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