Solve for I
\left\{\begin{matrix}I=\frac{U}{300\Omega }\text{, }&\Omega \neq 0\\I\in \mathrm{R}\text{, }&U=0\text{ and }\Omega =0\end{matrix}\right.
Solve for U
U=300I\Omega
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300\Omega I=U
Swap sides so that all variable terms are on the left hand side.
\frac{300\Omega I}{300\Omega }=\frac{U}{300\Omega }
Divide both sides by 300\Omega .
I=\frac{U}{300\Omega }
Dividing by 300\Omega undoes the multiplication by 300\Omega .
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