5p........5s.......6c.............1216 lei
2p........3s........7c.............737 lei
3p.........2s........9c..............589 lei ( le adunam membru cu membru)
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5p..........5s.........16c...........1326
5p..........5s...........6c............1216
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/ / 10c.........110 lei
c=110:10
c=11 lei
5p+5s+6c=1216
5p+5s+6*11=1216
5p+5s+66=1216
5p+5s=1216-66
5p+5s=1150
5*(p+s)=1150
p+s=1150:5
p+s=230 lei
2p+3s+7c=737
2p+2s+s+7*11=737
2*(p+s)+s+77=737
2*230+s+77=737
460+77+s=737
537+s=737
s=737-537
s=200 lei
p+s=230
p=230-200
p=30 lei
