Ответ:
y+x=7 x=7-y
y-x=1 x=7-4=3
y-7+y=1
2y=8
y=4
x=3
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Ответ:
y+x=7 x=7-y
y-x=1 x=7-4=3
y-7+y=1
2y=8
y=4
x=3