Решите систему уравнений способом сложения 1) 2(х+3у)+9=х+6 3(х-2у)=х+30 2) 5(3х+2)=7+12у 4(х+у)+х=31 3)4(3х+у)-1=у-2х 2(4х-у)+19=-х 4) 2(х+2у)-7у=6 5(2х+у)-х=2у+60
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