{7х+4у=74
{-6х-4у=-64
-----------------
х=10 ; 7•10+4у=74
70+4у=74
4у=4
у=1
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{7х+4у=74
{-6х-4у=-64
-----------------
х=10 ; 7•10+4у=74
70+4у=74
4у=4
у=1