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rozolva ecuatia 5*x-21:7=4+13

Răspuns :

 5*x-21:7=4+13
5x - 3 = 17 
5x = 17 + 3
5x = 20 
x = 20 : 5
x = 4 
5•x-21:7=4+13
5x=3+4+13=>5x=20=>x=4