Ответ:
-6n-15-4n=7-17n
-6n-4n+17n=7+15
7n=22
n=22:7
n=3,14
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Ответ:
-6n-15-4n=7-17n
-6n-4n+17n=7+15
7n=22
n=22:7
n=3,14