How to solve a Physics problem using Coulomb's law?

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libu0809

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Two equal charges are separated by 3.7' 10^-10m. The force between the charges has a magnitude of 2.37' 10^-3 N. What is the magnitude of q on the charges?

How would i find the answer if I used Coulomb's law:
F= k q^2/ r^2
q= r sqrt f/k

Please show work if possible! Thanks for any help!
 
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