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3^5(3^3x) + 3^7(3^-3x) - 12 = 0
243(3^3x) + 2187 - 12 = 0
3^3x
243(3^3x)² - 12(3^3x) + 2187 = 0
x1 + x2 = -b/a = 12/243 = 4/81