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y = 2x^2 -3x + 1
x -1 = 2x^2 -3x + 1
2x^2 -3x - x + 1 + 1
2x^2 -4x + 2
x^2 -2x + 1
(x-1)(x-1)
x= 1
y= x -1
= 1 -1 =0.
jadi nilai x= 1 dan nilai y =0