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[–] 17772781? [S] 1 point 0 points (+1|-1) ago 

I posted the result two times. The full proof is posted only once.

The short version is for you.

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[–] 17772856? 1 point -1 points (+0|-1) ago 

But it is wrong!

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[–] 17779336? [S] ago 

SHOW ME

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[–] 17772876? [S] ago 

What is wrong ?