Which among the choices is an identity equation?

a) 2(x - 4) = 2x - 8
b) y + x = 1
c) 5x + 5 = 5(x - 1)
d) 6x + 3 = 9x - 3

• A. 2(x - 4) = 2x - 8
• B. y + x = 1
• C. 5x + 5 = 5(x - 1)
• D. 6x + 3 = 9x - 3

Answer: (A)