1) 4\7х(-5 5\6)-5\62х(-4 3\7)
2)(5х+8)-(8х+14)=9
3)2.7+3у=9(у-2.1

1)=4/7х×(-35/6)-5/62х×(-31/7)==-10/3х+5/14х=-140/42х+15/42х=-125/42х==-2 41/42х2)5х+8-8х-14=9-3х-6=9-3х=9+6-3х=15х=15÷(-3)х=-53)2.7+3у=9у-18.93у-9у=-18.9-2.7-6у=-21.6у=-21.6÷(-6)у=3.6