Скорее по уровнение 35 (12m-5m)x4=252 4) (19n-6n): 4=26 2) (4n+3n)x11=154 5) (16m+5m): 18=7 3)45: (4m-m)=3 6) (17n-8n)x13=351

(12m-5m)x4=252 ; 28m=252; m=252:28; m=9; 4) (19n-6n):4=26; 13n=26*4; n=104:13; n=8;/// 2) (4n+3n)x11=154 ; 77n=154; n=154:77; n=2;/// 5) (16m+5m):18=7; 21m=18*7; m=126:21; m=6;/// 3)45:(4m-m)=3 ; 3m=45:3; m=15:3; m=5;/// 6) (17n-8n)x13=351; 9n*13=351; 9n=351:13; n=27:9; n=3