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a)7x+6x= 39,x€ N b) 5x-7=3,x €(-2,0,2,5) ajutor

Răspuns :

a) 7x + 6x = 39
13x = 39
x = 39 : 13
x = 3
b) 5x - 7 = 3
5x = 7 + 3
5x = 10
x = 10 : 5
x = 2