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3(3(9x-6)-2)-2=1
3(27x-18-2)-2=1
3(27x-20)-2=1
81x-60-2=1
81x-62=1
81x=1+62
81x=63 |:81
x = (63/81)
x = (7/9)
3[3{9x-6}-2]-2=1
3[27x-18-2]-2=1
81x-60-2=1
81x=1+60+2
81x=63/:81
x=63/81