Рашыце ўраўненне!!!!!!!!!!!!

в)не1 а 7

1-2,6х-(0,7х+3)=5,71-2,6х-0,7х-3=5,7-3,3х=5,7-1+3-3,3х=7,7-х=7,7:3,3   или -х = 7 7/10: 3 3/10х=-2,(3)              -х= 77/10*10/33                            -х= 2 1/3                             х= -2 1/32 1/3а-5/6=3 1/6а + 2/33 1/6а -2 1/3а= -5/6-2/35/6а= - 1 1/3а= -1 1/3 : 5/6а= - 4/3*6/5а= - 1 3/57-0,5z=0,2z-35-0,5z-0,2z=-35-7-0.7z=-42z=42:0,7 z=42: 7/10z= 42*10/7z=604 1/7+ (2 1/3у - 5 2/7)= 3  5/6у-1/74 1/7+2 1/3у -5 2/7=3 5/6у-1/73 5/6у -2 1/3у=4 1/7+1/71 3/6у= 4 2/7у= 4 2/7 : 1 3/6у= 30/7*6/9у= 30/21у= 1 3/7