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a1=x
|q|<1
q=x
x≠1/3
x/(1-x) = 2/(3x-1)
x(3x-1)=2(1-x)
3x²-x=2-2x
3x²+x-2=0
Δ=1+4*3*2=25
x=1/6*(-1-5)= -1 ∉ D v x=1/6(-1+5)=2/3
Odp. x=2/3.