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Răspuns :

E(x)= 14x cub + x -3 / 7x cub +18x -9
E(x)= 14x cub + 7x -6x -3 / 7x cub +21x -3x -9
E(x)= 7x(2x+1) -3(2x+1) / 7x(x+3) -3(x+3)
E(x)= (2x+1)(7-3) / (x+3)(7-3)
E(x)= 2x+1 / x+3

2x+1/x+3 = 2x/x+3 + 1/x+3
2x= x+3/x+3
2x=1
x=1/2
x= 1,5
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