1) 85+48: (11-х) = 912) 286-49: (2 х-5) = 791) (16m+5m) : 18=72) (17n-8n) * 13=351

1) 85+48: (11-х) = 91

48 / (11-х) = 91-85

48 / (11-х) = 6

11-х=48/6

11-х=8

-х=8-11

-х=-3

х=3

2) 286-49: (2 х-5) = 79

-49 / (2 х-5) = 79-286

-49 / (2 х-5) = -207

2 х-5=-49/-207

2 х-5=4 11/49

2 х=4 11/49+5

2 х=9 11/49

х=4 30/49

1) (16m+5m) : 18=7

16m+5m=7*18

16m+5m=126

21m=126

m=126/21

m=6

2) (17n-8n) * 13=351

17n-8n=351/13

9n=27

n=27/9

n=3