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cine ma ajuta repede dau coroana plz urgent ​

Cine Ma Ajuta Repede Dau Coroana Plz Urgent class=

Răspuns :

Răspuns:

7^x+7^x+2=2450

7^x(7^0+7^2)=2450

7^x(1+49)=2450

7^x=2450:50

7^x=49

x=2