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Proof step 1 from proof app-08 (conclusion)

⊦ a ' + x = a ' + y ↔ x = y

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: app-01: ⊦ x + y = x + z ↔ y = z;%a: ⊦ (x + y) + z = x + y + z;