{ х=5+3у
5х+6у=4
5(5+3у)+6у=4
у=-1
х=5+3*(-1)
х=2
(х,у)=( 2,-1)
{2-3*(-1)=5
5*2+6*(-1)=4
{5=5
4=4
(х,у)=(2,-1)
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{ х=5+3у
5х+6у=4
5(5+3у)+6у=4
у=-1
х=5+3*(-1)
х=2
(х,у)=( 2,-1)
{2-3*(-1)=5
5*2+6*(-1)=4
{5=5
4=4
(х,у)=(2,-1)