Current Attempt in Progress

Two particles are fixed to an $x$ axis: particle $1$ of charge $-2\mathrm{.}04{10}^{-7}C$ is at the origin and particle $2$ of charge $+2\mathrm{.}04{10}^{-7}C$ is at $x_2=13\mathrm{.}1cm.$ Midway between the particles, what is the magnitude of the net electric field?

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