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(2x-1) *4 = 20
Va rog







Răspuns :

2x - 1 = 20 : 4 
2x -1 = 5 
2x = 5  +1 
2x = 6 
x =3
S = {3}
(2x-1)x4=20
2x-1=20:4
2x-1=5
2x=5+1
2x=6
x=6:2
x=3