The area of a rectangle is $$\(18 \mathrm{~cm}^{2}\)$$ The length of the rectangle is $$\((\sqrt{7}+1) \mathrm{cm}\)$$. Without using a calculator and showing each stage of your working, find the width of the rectangle. Give your answer in the form $$\(a \sqrt{b}+c\)$$ where $$\(a, b\)$$ and $$\(c\)$$ are integers. $$\(\mathrm{cm}\)$$

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