Ответ: 1) 3.4+2y=7(y-2.3) 3,4+2y=7*y-7*2,33,4+2y=7y-16,12y-7y=-16,1-3,4-5y=-19,5-y=-19,5/5-y=-3,9-y*(-1)=-3,9*(-1)y=3,9Проверка:3,4+2*3,9=7*(3,9-2,3)3,4+7,8=7*1,611,2=11,22) 0.2(7-2y)=2.3-0.3*(y-6)0,2*7-0,2*2y=2,3-0,3*y+0,3*61,4-0,4y=2,3-0,3y+1,8-0,4y+0,3y=2,3+1,8-1,4-0,1y=2,7-y=2,7/0,1-y=27-y*(-1)=27*(-1)y=-27