7*(5+2у)-3у=13 35+14у-3у=13 11у=-22 у=-2
х=5+2у х=5+2у х=5+2у х=5+2*(-2) х=1
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7*(5+2у)-3у=13 35+14у-3у=13 11у=-22 у=-2
х=5+2у х=5+2у х=5+2у х=5+2*(-2) х=1