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The sequence $4 ; x ; y ; 18$ is such that $4 ; x ; y$ form an arithmetic sequence and $x,y$ and 18 form a geometric sequence

1. Using the common difference of the arithmetic sequence, determine $y$ in terms of $x$
2. Using the common ratio of the geometric sequence, determine $y$ in terms of $x$
3. Hence, or otherwise, calculate the value(s) of $x$ and $y$

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