Question: (18) 1. (x)(Ax Bx) 2. (x)[Ax (Bx Cx)] 3. (x)Ax (x)Bx / (x)Cx

(18) 1. (x)(Ax ≡ Bx)

2. (x)[Ax ⊃ (Bx ⊃ Cx)]

3. (∃x)Ax ∨ (∃x)Bx / (∃x)Cx

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