Solve the valid solutions of the following equations providing your values for some of them. Write your answers in solution set form. Identify the extraneous solution, if there is.
81^2x = 9^3x+4
812x=93x+481^{2x}=9^{3x+4}812x=93x+4
94x=93x+49^{4x}=9^{3x+4}94x=93x+4
4x=3x+44x=3x+44x=3x+4
x=4x=4x=4
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