Solve for N
\left\{\begin{matrix}N=\frac{I}{W}\text{, }&W\neq 0\\N\in \mathrm{R}\text{, }&I=0\text{ and }W=0\end{matrix}\right.
Solve for I
I=NW
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WN=I
Swap sides so that all variable terms are on the left hand side.
\frac{WN}{W}=\frac{I}{W}
Divide both sides by W.
N=\frac{I}{W}
Dividing by W undoes the multiplication by W.
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