Question: The replacement rule (a = -b): - (a = b), though not part of Klenk's system, is a truth-preserving rule. Explain why.

The replacement rule (a = -b): - (a = b), though not 


The replacement rule (a = -b): - (a = b), though not part of Klenk's system, is a truth-preserving rule. Explain why.

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