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Proof step 7 from proof del-append (previous step)

∀ y, a. (x0 + y) -l a = (x0 -l a) + (y -l a) ⊦ a = a0, (x0 + y) -l a = (x0 -l a) + (y -l a)

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 1 terms: y, a

Additional information

Used terms: y, a