Răspuns:
4024-a=2878
6109-d=2188
b-3467=4856
8200-e=6153
c+2196=5003
f-6387=2890
=>
4024-2878= 1146
4024-1146=2827
6109-2188=3921
6109-3921=2188
4856+3467=8323
8323-3467=4856
8200-6153=2047
8200-2047=6153
5003-2196=2807
2807+2196=5003
6387+2890=9277
9277-6387=2890