45:(4m-m)=3; (19n-6n):4=26; (16m+5m):18=7; (17n-8n)*13=351

Question

45:(4m-m)=3; (19n-6n):4=26; (16m+5m):18=7; (17n-8n)*13=351

Answer 1

Вот, пожалуйста))))))))))

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Answer 2

45:3m=3
3m=45:3
3m=15
m=15:3
m=5

13n:4=26
13n=26×4
n=104:13
n=8

21m:18=7
21m=7×18
21m=126
m=6

9n×13=351
9n=351:13
9n=27
n=3