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(2x-1)(x+1)=(3+x)(x-1)
2x²+2x-x-1=3x-3+x²-x
x²+x-2x-1+3=0
x²-x+2=0
Δ=1-4*2=-7<0 rownanie sprzeczne
2x²+x-1=x²+2x-3
x²-x+2 √Δ=1-4*1*2= -7 (nie ma rozw.)