Solve for g (complex solution)
\left\{\begin{matrix}g=\frac{Fr^{2}}{m_{1}m_{2}}\text{, }&m_{2}\neq 0\text{ and }m_{1}\neq 0\text{ and }r\neq 0\\g\in \mathrm{C}\text{, }&\left(m_{2}=0\text{ or }m_{1}=0\right)\text{ and }F=0\text{ and }r\neq 0\end{matrix}\right.
Solve for g
\left\{\begin{matrix}g=\frac{Fr^{2}}{m_{1}m_{2}}\text{, }&m_{2}\neq 0\text{ and }m_{1}\neq 0\text{ and }r\neq 0\\g\in \mathrm{R}\text{, }&\left(m_{2}=0\text{ or }m_{1}=0\right)\text{ and }F=0\text{ and }r\neq 0\end{matrix}\right.
Solve for F
F=\frac{gm_{1}m_{2}}{r^{2}}
r\neq 0
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Fr^{2}=gm_{1}m_{2}
Multiply both sides of the equation by r^{2}.
gm_{1}m_{2}=Fr^{2}
Swap sides so that all variable terms are on the left hand side.
m_{1}m_{2}g=Fr^{2}
The equation is in standard form.
\frac{m_{1}m_{2}g}{m_{1}m_{2}}=\frac{Fr^{2}}{m_{1}m_{2}}
Divide both sides by m_{1}m_{2}.
g=\frac{Fr^{2}}{m_{1}m_{2}}
Dividing by m_{1}m_{2} undoes the multiplication by m_{1}m_{2}.
Fr^{2}=gm_{1}m_{2}
Multiply both sides of the equation by r^{2}.
gm_{1}m_{2}=Fr^{2}
Swap sides so that all variable terms are on the left hand side.
m_{1}m_{2}g=Fr^{2}
The equation is in standard form.
\frac{m_{1}m_{2}g}{m_{1}m_{2}}=\frac{Fr^{2}}{m_{1}m_{2}}
Divide both sides by m_{1}m_{2}.
g=\frac{Fr^{2}}{m_{1}m_{2}}
Dividing by m_{1}m_{2} undoes the multiplication by m_{1}m_{2}.
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