алгебра 7 класс.
решить уравнение:(у+3)(у-3)+(у+1)(1-у)=2у
х²+5х+6=0
5а(а-2)-3а²(2-а)=0
3х(4-7х)-(7х-4)=0
9х²+6х+1=0
9х²+6х+1=0
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