Spring Force = $F_s$
Charge Force = $F$
If the system is balanced Based on Newton's Law On the horizontal line Is it $2F_s = F$ Or $F_s = F$ ?
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Hint: Try drawing a free-body diagram. The horizontal force on the mass is spring force and charge(if the mass has charged). The direction of restoring force is in such a direction to restore the initial state of spring and the direction of coulomb force depends on the sign of charge.