Ответ:
a-b+c=0
5-x+3=0
5-8+3=0
a+b-c=0
x+2-7=0
5+2-7=0
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Ответ:
a-b+c=0
5-x+3=0
5-8+3=0
a+b-c=0
x+2-7=0
5+2-7=0