Solve for R
R=z-jx
Solve for j
\left\{\begin{matrix}j=-\frac{R-z}{x}\text{, }&x\neq 0\\j\in \mathrm{R}\text{, }&z=R\text{ and }x=0\end{matrix}\right.
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R+jx=z
Swap sides so that all variable terms are on the left hand side.
R=z-jx
Subtract jx from both sides.
R+jx=z
Swap sides so that all variable terms are on the left hand side.
jx=z-R
Subtract R from both sides.
xj=z-R
The equation is in standard form.
\frac{xj}{x}=\frac{z-R}{x}
Divide both sides by x.
j=\frac{z-R}{x}
Dividing by x undoes the multiplication by x.
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