There is no equals sign, so there is nothing to "solve". What is it that you are being asked to do with this expression?
By the way, use the underscore character to do a plain text rendering of a subscript. Further, read "base b log of x" from which you should render in plain text as log_b(x)
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it