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30:(a+19)=80:2:5:4:2


Răspuns :


30:(a+19)= 40 :5:4:2

30:(A+19)= 8:4:2

30 :(A+19)= 2:2

30:(A+19)=10 l * 30

a+19 = 300 - 19

a = 281