Ответ:
1)
|x-4|=0
x-4=0
x-4+4=0+4
x=0+4
x=4
2)
|7+a|=-9
А є ∅
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Ответ:
1)
|x-4|=0
x-4=0
x-4+4=0+4
x=0+4
x=4
2)
|7+a|=-9
А є ∅