Ответ:
5+[5-x]=7
[5-x]=7-5
[5-x]=2
5-x=2
5-x= -2
x1=3
x2=7
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Ответ:
5+[5-x]=7
[5-x]=7-5
[5-x]=2
5-x=2
5-x= -2
x1=3
x2=7