Find the coefficients of \(x\) in the given expressions:
I) the coefficients of \(x\) is \(=\).
II) the coefficients of \(x\) is \(=\).
III) the coefficients of \(x\) is \(=\).
IV) the coefficients of \(x\) is \(=\).
[Note: If the answer is a negative number, insert the answer along with negative sign].