1) 2*(1,2у+5)-1=2у+6,6; __ 2,4у+10-1=2у+6,6; ___ 2,4у-2у=6,6-9; __ 0,4у=-2,4; __ у=-2,4:0,4=-6. ___________________________________________________ 2) -4(2+3х)+11=-15х-3; ___ -8-12х+11=-15х-3; ___ -12х+15х=-3-3; __ 3х=-6; __ х=-6:3=-2. _____________________________________________________________ 3) 0,2(3у+2)=2,6у-1,6; ___ 0,6у+0,4=2,6у-1,6; ___ 0,6у-2,6у=-1,6-0,4; __ -2у=-2; __ у=-2:(-2)=1