Ответ:
x=y-4
-(y-4)+2y+1=0
-y+4+2y+1=0
-y+2y=-4-1
y=-5
x=-5-4
x=-9
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Ответ:
x=y-4
-(y-4)+2y+1=0
-y+4+2y+1=0
-y+2y=-4-1
y=-5
x=-5-4
x=-9