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2014-10-08T21:19:03+03:00
{[(x+3)*3+3]}*3+3=120
[(3x+9+3)*3+3=120
[(3x+12)*3+3]*3+3=120
(9x+39)*3+3=120
27x+117+3=120
27x=120-120
27x=0
x=0