a-(425127-139450)=13500
a - 285677 = 13500
a = 13500 + 285677
a = 299177
a-(215308+17940)=298425
a - 233248 = 298425
a = 298425 + 233248
a = 531673
(976504-25742)-a=400820
950762 - a = 400820
950762 - 400820 = a
a = 549942
(756129+125000)-a=529940
881129 - a = 529940
881129 - 529940 = a
a = 351189