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2(x+3) + 2x = x(x+3)
2x + 6 + 2x = x² + 3x
4x + 6 = x² + 3x
x² + 3x - 4x - 6= 0
x² - x - 6 = 0
(x - 3)(x + 2) = 0
x = 3 atau x = - 2