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Step * 1 1 1 of Lemma minus-minus

.....wf..... 
1. x : ℤ
⊢ -x ∈ ℤ
BY
{ RepeatFor 2 (MemCD) }

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Latex:

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Latex:
.....wf..... 
1.  x  :  \mBbbZ{}
\mvdash{}  -x  \mmember{}  \mBbbZ{}


By

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Latex:
RepeatFor  2  (MemCD)

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