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Proof step 1 from proof c-01 (conclusion)

⊦ x + (a + y) = x + a ' + y

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: c: ⊦ a + x = a ' + x;%a: ⊦ (x + y) + z = x + y + z;%app-03: ⊦ x + y = z + y ↔ x = z;