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Write the coefficient of (i) x in 13x ...

Write the coefficient of
(i) x in 13x
(ii) y in - 5y
(iii) a in 6ab
(iv) z in - 7xz
(v) p in - 2 pqr
(vi) `y^(2)` in `8xy^(2)z`
(vii) `x^(3)` in `x^(3)`
(viii) `x^(2)` in `-x^(2)`

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