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1 i 2/3:(-2 i 2/3+3/2)=5/3:(-8/3+3/2)=5/3:(-16/6+9/6)=5/3:(-7/6)=
=5/3*(-6/7) skróć 3 i 6 przez 3 =(-10/7)=(-1 i 3/7)