{х+6у=-3➡️{х+6у=-3➡️3у+6у=-3➡️у=-1/3
{х-3у=0➡️{х=3у➡️{х=3у➡️х=-1
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{х+6у=-3➡️{х+6у=-3➡️3у+6у=-3➡️у=-1/3
{х-3у=0➡️{х=3у➡️{х=3у➡️х=-1