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[1+0,4*-1 2/3]*[0,8-1,2:2,4+3/8*(-1,6)]:(-1/2)=
1 2/3*[0,8-1/2+3/8*(-1,6)]:(-1/2)=
1 2/3*[0,3+(-0,6)]:(-1/2)=
1 2/3*(-0,3):(-1/2)=
-0,5:(-1/2)=
1
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