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Proof step 9 from proof modex-odd-neg-01 (previous step)

2 * (i0 + 1) = i + 1, i0 < 0 ⊦ i = 2 * i0 + 1

User applied rule cut formula

And obtained the following new goals

Rule argument

fma: i = 2 * i0 + 1

Additional information

Used formulas: i = 2 * i0 + 1