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0 = x^2 - 2x +1
0 = (x-1)^2
x = 1
b. -x +10 = x^2+3x -11
0 = x^2 +4x -21
0 = (x+7)(x-3)
x = -7 atau x = 3
c. 6x- 5 = 3x^2-8x + 3
0 = 3x^2 - 14x + 8
0 = (3x-2)(x-4)
x = 2/3 atau x =4