Which equation is an identity? a. 3(x - 1) = x + 2(x + 1) + 1
b. x - 4(x + 1) = -3(x + 1) + 1
c. 2x + 3 = 1/2 (4x + 2) +2
d. 1/3 (6x – 3) = 3(x + 1) –x2

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