4/13(6,5n- 3 1/4 m)- 3,2 (5/8n - 0,5 m)

4/13 • (65n/10 - 13m/4) - 32/10 • (5n/8 - 5m/10)== 4/13 • 13/2 • (5n/5 - m/2) - 32/10 • (5n/8 - m/2)== 2 • (n - m/2) -16/5 • (5n/8 - m/2) == 2n - m - 2n + 8m/5 == -5m/5 + 8m/5 = 3m/5 = 0,6m