Ответ:
2х-2х-у+у=0
-а+2а-b+2b=а+b
7-b-14-2b=-7-3b
3b-18-b+8=2b-10
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Ответ:
2х-2х-у+у=0
-а+2а-b+2b=а+b
7-b-14-2b=-7-3b
3b-18-b+8=2b-10