Răspuns:
A=10+27=5272
A=5272-37
A=5235
(b+3)x100-4200=5800
(b+3)x100=5800-4200
(b+3)x100=1600
(b+3)=1600:100
(b+3)=16
b=16-3
b=13
3290-cx100+460=750
3290-cx100=750-460
3290-cx100=290
cx100=3290-290
cx100=3000
c=3000:100
c=30
Dx1000:10-210x100=8900
Dx1000:10-21000=8900
Dx1000:10=8900+21000
Dx1000:10=29900
Dx100=29900
D=29900:100
D=299