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Proof step 3 from proof sub-add (previous step)

⊦ mkDecimal(i, i0) + dec_j - dec_j = mkDecimal(i, i0)

User applied rule constructor cut

And obtained the following new goals

Proof step 4:
dec_j = mkDecimal(i1, i2) ⊦ mkDecimal(i, i0) + dec_j - dec_j = mkDecimal(i, i0)

Rule argument

var: dec_j

Additional information

Used simplifier rules: decimal generated by mkDecimal;;