1.8х-(0.3х+2у)= 1.8х-0.3х-2у= 1.5х-2у
Умножим на 2:
3х-4у= -(4у-3х)= -8
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1.8х-(0.3х+2у)= 1.8х-0.3х-2у= 1.5х-2у
Умножим на 2:
3х-4у= -(4у-3х)= -8