n=a+b/2-c | ×2
2n=a+b-2c
-a=b-2c-2n
a=2n+2c-b
Ответ: Д) 2n+2c-b
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n=a+b/2-c | ×2
2n=a+b-2c
-a=b-2c-2n
a=2n+2c-b
Ответ: Д) 2n+2c-b