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rezolva ecuatia 7x+(13-21)=48 va rog​

Răspuns :

7x+(-8)=48
7x-8=48
7x=48+8
7x=56
x=56/7
x=8

7x+(13-21)=48

7x+13=48+21

7x+13=69

7x=69-13

7x=56

x=56:7

x=8