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rezolvati ecuatiile x-4=9 2x=16 10-x=3

Răspuns :

x-4=9
x=4+9
x=13

2x=16
x=16:2
x=8

10-x=3
x=10-3
x=7
x-4=9 |+4
x=13

2x=16 |:2
x= 8

10-x=3
x= 10-3
x= 7