Question: Consult the same proof from the last two questions. (Again, this is the argument: (x)(Fx Gx), ~(x)Gx / ~(x)Fx) Which rule justifies the final line

Consult the same proof from the last two questions. (Again, this is the argument: (x)(Fx Gx), ~(x)Gx / ~(x)Fx) Which rule justifies the final line of the proof

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