1) 9,6(2+х)+0,4х , 2) 3,8(х+5)-1,8х , 3) 1,7(4+у)+1,3у

9,6(2+х)+0,4х=19,2+9,6x+0,4x=19,2+10x3,8(х+5)-1,8х=3,8x+19-1,8x=2x+191,7(4+у)+1,3у=6,8+1,7y+1,3y=6,8+3y