The force on $q$ by $q_{1}$ is given by $F_{1} = k \frac{|q q_{1}|}{x^{2}}$ and the force on $q$ by $q_{2}$ is given by $F_{2} = k \frac{|q q_{2}|}{(5+x)^{2}}$. Since the forces due to $q_{1}$ and $q_{2}$ are in opposite directions, we can write the net force on
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