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x-1 , x+1 , 5x-1 => progresie aritmetica
x=?


Răspuns :

x+1=(x-1+5x-1)/2

x+1=(6x-2)/2

6x-2=2(x+1)

6x-2=2x+2

6x-2x=2+2

4x=4

x=1