Răspuns :
C=16.5+c
C=8c+0.75, egalam
16.5+c=8c+0.75
7c=15.75
c=2.25
C=16.5+225
C=18.75
*C=carte, c=caiet
C=8c+0.75, egalam
16.5+c=8c+0.75
7c=15.75
c=2.25
C=16.5+225
C=18.75
*C=carte, c=caiet