mfr81
18.02.2020 •
Mathematics
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Ответ:
12. -6n-20=-2n+4(1-3n) 14n. 7(5a-4)-1=14-8a
-6n-20=-2n+4-12n 35a-29=14-8a
-4n=16-12n 43a=43
8n=16 a=1
N=2