Solve for I
\left\{\begin{matrix}I=\frac{Fr}{2I_{2}Lk}\text{, }&I_{2}\neq 0\text{ and }L\neq 0\text{ and }k\neq 0\text{ and }r\neq 0\\I\in \mathrm{R}\text{, }&\left(I_{2}=0\text{ or }L=0\text{ or }k=0\right)\text{ and }F=0\text{ and }r\neq 0\end{matrix}\right.
Solve for F
F=\frac{2II_{2}Lk}{r}
r\neq 0
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Fr=2kLII_{2}
Multiply both sides of the equation by r.
2kLII_{2}=Fr
Swap sides so that all variable terms are on the left hand side.
2I_{2}LkI=Fr
The equation is in standard form.
\frac{2I_{2}LkI}{2I_{2}Lk}=\frac{Fr}{2I_{2}Lk}
Divide both sides by 2kLI_{2}.
I=\frac{Fr}{2I_{2}Lk}
Dividing by 2kLI_{2} undoes the multiplication by 2kLI_{2}.
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