(12m-5m)*4=252
раскроем скобки
48m-20m = 252
28m-252 = 0
28m = 252
m = 9
(4n+3n)*11=154
44n+33n = 154
77n-154 = 0
77n = 154
n = 2
45:(4m-m)=3
(4m-m)=45:3
4m-m=15
3m=15
m=15:3
m=5
(19n-6n):4=26
13n:4=26
13n=26*4
13n=104
n=104:13
n=8
(16m+5m):18=7
21m:18=7
21m=18*7
21m=126
m=126:21
m=6
(17n-8n)*13=351
9n*13=351
9n=351:13
9n=27
n=27:9
n=3
(12m-5m)*4=252
раскроем скобки
48m-20m = 252
28m-252 = 0
28m = 252
m = 9
(4n+3n)*11=154
раскроем скобки
44n+33n = 154
77n-154 = 0
77n = 154
n = 2
45:(4m-m)=3
(4m-m)=45:3
4m-m=15
3m=15
m=15:3
m=5
(19n-6n):4=26
(19n-6n):4=26
13n:4=26
13n=26*4
13n=104
n=104:13
n=8
(16m+5m):18=7
21m:18=7
21m=18*7
21m=126
m=126:21
m=6
(17n-8n)*13=351
9n*13=351
9n=351:13
9n=27
n=27:9
n=3