(-0.7x +0.6y)5-3(0.4y-1.5x)=-3,5х+3у-1,2у+4,5х=х+1,8у
(-0,7x +0,6y)5-3(0,4y-1,5x)=-3,5х+3у-(1,2у-4,5х)=-3,5х+3у-1,2у+4,5х=х+1,8у
(-0.7x +0.6y)5-3(0.4y-1.5x)=-3,5х+3у-1,2у+4,5х=х+1,8у
(-0,7x +0,6y)5-3(0,4y-1,5x)=-3,5х+3у-(1,2у-4,5х)=-3,5х+3у-1,2у+4,5х=х+1,8у