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Proof step 5 from proof add-a (previous step)

⊦ mkDecimal(i, i0) + mkDecimal(i1, i2) + dec2 = (mkDecimal(i, i0) + mkDecimal(i1, i2)) + dec2

User applied rule constructor cut

And obtained the following new goals

Proof step 6:
dec2 = mkDecimal(i3, i4) ⊦ mkDecimal(i, i0) + mkDecimal(i1, i2) + dec2 = (mkDecimal(i, i0) + mkDecimal(i1, i2)) + dec2

Rule argument

var: dec2

Additional information

Used simplifier rules: decimal generated by mkDecimal;;