Ответ:
1) (x)=7
x-7=7-7
x-7=0
2) (x)=-4
x+4=-4+4
x+4=0
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Ответ:
1) (x)=7
x-7=7-7
x-7=0
2) (x)=-4
x+4=-4+4
x+4=0