What am I?

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What am I?

Decapitate me and all becomes equal. Then truncate me and I become second. Cut me front and back and I become two less than I started.

Decapitate me and all becomes equal. Then truncate me and I become second. Cut me front and back and I become two less than I started.

Answer
Seven: even (equal); eve (2nd person, according to the Bible); v (Roman numeral five; two less than seven)