Prima problema:
1) 1980:18=110----lei costa un ghiozdan
18x=1980
x=1980:18
x=110
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A doua problema:
1)26+22=48-------caiete a cumpărat Iona
2)100-4=96-------- lei costa caietele
3) 96:48=2--------- lei costa un caiet
22x+27x=100-4
48x=100-4
48x=96
x=96:48
x=2