пожайлусто)3.07х-2.691=7.83+о.97х                    12-3(7-х)=9-4(х+5) 32.7-18.3у=32.42+16.7у                             4(2х-5)-8=-7+5(4-9х) 39.24+11.52х=14.19-13.48х -2.57у-0.108=0.132+3.43у                        

3.07х-2.691=7.83+0.97х    3.07х-0.97х=7.83+2.691 2.1х=10.521 х=10.521:2.1 х=5.01   32.7-18.3у=32.42+16.7у     32.7-32.42=16.7у+18.3у 0.28=35у у=0.28:35 у=0.008   -2.57у-0.108=0.132+3.43у   -2.57у-3.43у=0.132+0.108 -6у=0.24 у=0.24:(-6) у=-0.04   12-3(7-х)=9-4(х+5) 12-21+3х=9-4х-20 3х+4х=9-20-12+21 7х=-2 х=-2:7 х=-2/7      4(2х-5)-8=-7+5(4-9х) 8х-20-8=-7+20-45х 8х+45х=-7+20+20+8 53х=41 х=41/53