Раскройте скобки и упростите выражение 
3(a- b)  - 2(a+b) 
4(x+ y) + 5(2x - y) 
2,4 ( c - 3d) - 1,3(2c- d) 
- 3/4 (1/3m+ n ) - 1/4 (3m + n)  
 Помогите пожалуйста 


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