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x² - 2x + 1 + x² + x² + 2x + 1
3x² + 2
b. 1
x - 1 + 2x + 3x + 1 = 6
6x = 6
x = 1
b.2
x - 1 + 2x + 3x + 1 = -6
6x = -6
x = -1