3086-a =1708
a=3086-1708
90.548-a=3000
a=90.548-3000
48.317+a=50.366
a=50.366-48.317
28.489+a=47.193
a=47.193-28.489
a+1986=12606
a=12.606-1986
a-1022=7085
a=7085+1022
a-34.599=4207
a=34.599+4207
10.474-a=1059
a=10.474-1059
