х=3у-9
0,9х-0,7х-0,6у=0,2х+0,6у=0,6у-1,8-0,6у=-1,8
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х=3у-9
0,9х-0,7х-0,6у=0,2х+0,6у=0,6у-1,8-0,6у=-1,8