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Feb 24, 2016 at 6:04 vote accept Alireza Abdollahi
Feb 23, 2016 at 18:09 comment added Derek Holt Excellent! Of course you also need to show that $x \ne 1$, which could be difficult in general, but fortunately its image in $G/[G,G]$ is nontrivial.
Feb 23, 2016 at 17:44 history answered user6976 CC BY-SA 3.0