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A charge 3q is at the origin, and a charge -2q is on the positive x-axis at x = a. Where would you place a third charge so it would experience no net electric force?

I currently set up two equations:

1. 3q*q/b^2 where b is in between the origin and and x=a

2. 2q*q/(a-b)^2

I try to solve for b but i get lost in the process and can't find the answer...

the answer is b=5.45a

Thank you so much :)