3x² + 9x = 12x - x²
3x² + x² + 9x - 12x = 0
4x² - 3x = 0
x(4x - 3) = 0
x=0
x=3/4
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3x² + 9x = 12x - x²
3x² + x² + 9x - 12x = 0
4x² - 3x = 0
x(4x - 3) = 0
x=0
x=3/4