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2743+a=7048 => a=7048-2743=4305
8423-b=3575 => b=8423-3575=4848
c+394=4985 => c=4985-394=4591
d-597=3729 => d=3729+597=4326

(245+1745)-m=873
1990-m=873
m=1990-873=1117

n-(8740-2903)=157
n-5837=157
n=157+5837
n=5994

2743+a=7048
a=7048-2743
a=4305
2743+4305=7043

8423-b=4575
b=8423-4573
b=3850
8423-3850=4575

c+394=4985
c=4985-394
c=4591
4591+394=4985

d-597=3729
d=3729+597
d=4326
4236-597=3729

(245+1745)-m=873
1990-m=873
m=1990-873
m=1117
1990-1117=873

n-(8740-2903)=157
n-5837=157
n=157+5837
n=5994
5994-5837=157