Ответ:
4
-х+у=8|•-1 х-у=-8 | 13х=-26 х=-2
12х+у=-18 12х+у=-18|+ -х+у=8 2+у=8
у=6 х= -2
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Ответ:
4
-х+у=8|•-1 х-у=-8 | 13х=-26 х=-2
12х+у=-18 12х+у=-18|+ -х+у=8 2+у=8
у=6 х= -2