(-1+2*1+1/3)-(4*(-1)-8*1-2*1/3)=(-1+1/3)-(-12-2/3)=2/3+12+2/3=13 i 1/3
(x+2y+z)-(4x-8y-2z)=
=x+2y+z+4x+8y+2z=
=5x+10y+3z=
=5*(-1)+10*1+3*1/3=
=(-5)+10+1=
=6
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(-1+2*1+1/3)-(4*(-1)-8*1-2*1/3)=(-1+1/3)-(-12-2/3)=2/3+12+2/3=13 i 1/3
(x+2y+z)-(4x-8y-2z)=
=x+2y+z+4x+8y+2z=
=5x+10y+3z=
=5*(-1)+10*1+3*1/3=
=(-5)+10+1=
=6