The equation in the question is given below
[tex]\begin{gathered} z=b+m-a \\ R\mathrm{}H\mathrm{}S=L\mathrm{}H\mathrm{}S \end{gathered}[/tex]
To solve for a, we will, first of all, identify the coefficient of a
The coefficient of a is
[tex]=-1[/tex]
To make a positive we will take a to the R.H.S and then take z to the L.H.S
Hence, we will have
[tex]\begin{gathered} z=b+m-a \\ a=b+m-z \end{gathered}[/tex]
Hence,
The equation for a will be
a= b + m - z
