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3^x²-3x = (-9^x)² / 3
3^x²-3x = 81^x² / 3
3^x²-3x = 27^x²
3^x²-3x = 3³^x²
x² - 3x = 3x²
x² - 3x² - 3x = 0
-2x² - 3x = 0
x(-2x - 3) = 0
x = 0 atau - 2x - 3 = 0
-2x = 3
x = - 3/2