Найдите Решение системы уравнений способом подстановки:
1)2(х+у)-х=-6
3х-(х-у)=0
2)3(х+2у)-у=27
4(х+у)-3х=23
3)5х-2(у+4)=0
6(2х+3)-у=41
4)2х+3(х+у)=11
7(х+3у)-6х=-59
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