12347+308-a=1156
12655-a=1156
a=12655-1156
a=11499
12347+308-11499=1156
(14650-26)+c=50000
14624+c=50000
c=50000-14624
c=35276
(14650-26)+35276=50000
20543+b+602=23450
b+21145=23450
b=23450-21145
b=2305
20543+2305+602=23450
d-(560+3070)=11175
d-3630=11175
d=11175+3630
d=14805
14805-(560+3070)=11175
