Ответ:
2n+20-6=0
2n= -14
n= -7
3n+4n+7=0
7n+7=0
7n= -7
n= -1
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Ответ:
2n+20-6=0
2n= -14
n= -7
3n+4n+7=0
7n+7=0
7n= -7
n= -1