СРОЧНО, ДАЮ 20 БАЛЛОВ
Решить системы уравнениё ( подробно)
1) 2х+у=2
6х-2у=1
2) х+7у=2
5х+13=12
3) 5( 3х+у)-8( х-6у)=20
6( х-10у)-13( х-у)=52
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