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1/3{1/3[1/9x-3+6]+3}=1/81x
1/3{1/27x-1+2+3}=1/81x
1/81x-1/3+2/3+1=1/81x
1/3+1=0
1+1/3=0
Równanie nieprawidłowe! 1+1/3≠0