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Proof step 1 from proof get-last-01 (conclusion)

⊦ (a + x)[# x] = (a + x).last

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ (a ' + x)[# x] = (a ' + x).last

Rule argument

Additional information

Used simplifier rules: ⊦ a + x = a ' + x; (s)