3у-6х=12; у-2х=4; у=2х+4; х=0 у=4; х=-1 у=2
4у+2х=4; 2у+х=2; у=(2-х)/2; х=0 у=1; х=2 у=0
3х=- 5у; 3х+5у=0; у=3х/5; х=5 у=3; х=0 у=0
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3у-6х=12; у-2х=4; у=2х+4; х=0 у=4; х=-1 у=2
4у+2х=4; 2у+х=2; у=(2-х)/2; х=0 у=1; х=2 у=0
3х=- 5у; 3х+5у=0; у=3х/5; х=5 у=3; х=0 у=0