giúp mk vs ạ 1-x/x+1-3+2x/x+1=0 1-x/x+1+3=2x+3/x+1 1/x-2+4=2x-3/x-2 7/2x-3+1=6-2x/2x-3 8-x/x-7-8=1/x-7

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