Charge on capacitor connected between spheres

1. The problem statement, all variables and given/known data
Two metallic spheres, each of radius R having charges 2Q and Q are joined through a capacitor of capacitance C as shown in the figure. Assuming R<<d, the charge on the capacitor long time after the key K is closed is:

(Ans: ##\dfrac{Q}{2+\frac{4\pi \epsilon_0 R}{C}}##)

2. Relevant equations

3. The attempt at a solution
The final distribution of charges should be as shown in attachment 2.
From conservation of energy:
where ##x=4\pi \epsilon_0 R##.

Solving the above doesn’t give me the right answer. :confused:

Any help is appreciated. Thanks!

Attached Images
File Type: png capacitor and spheres 1.png (8.2 KB)
File Type: png capacitor and spheres 2.png (8.5 KB)

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