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Two point charges lie on the x axis. A charge of + 2.40 pC is at...

Two point charges lie on the x axis. A charge of + 2.40 pC is at the origin, and a charge of − 4.60 pC is at x=−13.0cm. What third charge should be placed at x=+20cm so that the total electric field at x=+10.0cm is zero?

Please help, I am not sure why my answer is wrong, I set up formula and did the steps but something isn't working. Please help. Thank you!

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