Răspuns:
1) ( 3687-1848)+ a= 7000
1839 + a= 7000
a= 7000 - 1839
a= 5161
2) ( c- 1789) +4857=10000
c-1789= 10000-4857
c-1789= 5143
c= 5143+ 1789
c= 6932
3) (d+3775) -3095= 2680
d+3775 = 3095+ 2680
d+ 3775= 5775
d= 5775-3775
d=2000
4) 7000-(2813+b) = 3732
2813+b= 3732+7000
2813+b=10732
b= 10732-2813
b= 7919