\( \sqrt{ 7 - 30\sqrt{-2}} = \pm (\frac{ a + b\sqrt{c} }{d}) \)

a, b, c, d are positive integers

a and d are coprime.

c is not divisible by the square of any prime.

Find a + b + c + d .

###### Note - this problem is a part of the sets - 3's & 4's & QuEsTiOnS.

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