4/13(6,5n- 3 1/4 m)+ 3,2 (5/8n - 0,5 m)
4/13(6,5n-3 1/4m)+3,2(5/8-0,5m)=4/13*(13/2n-13/4+16*(5/8n-1/2ml=2n-m+2n-8/5m=4n-13/5m