(3x+1)(3x-2)-(3x-1)²=11
(3х+1)(3х-2)-(3х-1)²=11 9х²-6х+3х-2-(9х²-6х+1)=11 9х²-6х+3х-2-9х²+6х-1=11 -6х+3х-2+6х-1=11 3х-3=11 3х=11+3 3х=14 х= ответ:14/3