A) The equation x + 11 = 6 is equivalent to x + 6 = 11 since 6 + 11 = 11 + 6.

B) The equation 2x + 12 = 22 is equivalent to x + 6 = 11 since 2 (x + 6) = 2 (11).

C) The equation x + 9 = 14 is equivalent to x + 6 = 11 since (x + 6) + 3 = 11 + 3.

D) The equation x - 1 = 4 is equivalent to x + 6 = 11 since (x + 6) - 7 = 11 - 7.

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