(-2 1/2*1 1/14 +3):0.005-(-4):(-1/5)=
=(-5/2*15/14+3):0,005-(-4)*(-5)=
=(-75/28+3):0,05-20=
=(-2 19/28+3):0,05-20=
=9/28 :5/100-20=
=9/28*100/5-20=
= 9/28*20-20=
=180/28-20=
=6 12/28-20=
=6 3/7-20=-13 4/7
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(-2 1/2*1 1/14 +3):0.005-(-4):(-1/5)=
=(-5/2*15/14+3):0,005-(-4)*(-5)=
=(-75/28+3):0,05-20=
=(-2 19/28+3):0,05-20=
=9/28 :5/100-20=
=9/28*100/5-20=
= 9/28*20-20=
=180/28-20=
=6 12/28-20=
=6 3/7-20=-13 4/7