х+4у=-12
1)х+4у=-12
х= -12 - 4
х= -8
2) -2х+у=7
у= 7-(-2)
у=5
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1)х+4у=-12
х= -12 - 4
х= -8
2) -2х+у=7
у= 7-(-2)
у=5