Ответ:
1) (a-5)x=5
a-5=0
a=5
2) (a+7)x=a+7
a+7=0
a=-7
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Ответ:
1) (a-5)x=5
a-5=0
a=5
2) (a+7)x=a+7
a+7=0
a=-7