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y = y
x^2 - 3x + 2 = x - 1
x^2 - 3x - x + 2 + 1 = 0
x^2 - 4x + 3 = 0
(x - 1) (x - 3) = 0
x = 1 atau x = 3
Maka nilai x = 1 atau x = 3