Решить систему уравнений способом подстановки помогите срочно нужно!!
{х-у=2
{х-2у=4

{ у-х=0
{3х+у=8

{3х+2у=7
{х-2у=3

{m-3n=8
2m-3n=10

{1/3(х-у) =4
{1/4(х+у) =2

{х-2у=-8
{х-3у=-8


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