[m]r^2=\frac{G\cdot m_{1}\cdot m_{2}}{F}[/m]
[m]r=\sqrt{\frac{G\cdot m_{1}\cdot m_{2}}{F}}[/m]
[m]\sqrt{\frac{6,67\cdot 10^{-11}\cdot 2\cdot 10^{6}\cdot 4\cdot 10^{6}}{13,34\cdot 10^{-3}}}=\sqrt{\frac{6,67\cdot 2\cdot 4\cdot 10^{-11+6+6}}{13,34\cdot 10^{-3}}}=\sqrt{\frac{ 4\cdot 10}{ 10^{-3}}}=\sqrt{4\cdot 10^{1-(-3)}}=\sqrt{4\cdot 10^4}=2\cdot 10^2=200[/m]