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20-c daca c+c+c+c+3=18

20c Daca Cccc318 class=

Răspuns :

4c+3=18

4c=15

c=15/4

20-c=20-15/4=(4*20-15)/4=(80-15)/4=65/4

Sper ca te-am ajutat

3c+3=18

3c=18-3

3c=15=>c=5

20-5=15