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24:4+36:6-(35+7):6+(21+7):(15-8)=r+5

Răspuns :

24:4+36:6-42:6+28:7=r+5
6+6-7+7=r+5
12-7+7=r+5
5+7=r+5
12=r+5
r=12-5=7
24:4+36:6-42:6+28:7=r+5
6+6-7+4=r+5
12-11=r+5
1=r+5
r=5-1
r=4