31/2-(-21/4)+(-1/3)-1/4-(+1/6)=
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31/2-(-21/4)+(-1/3)-1/4-(+1/6)=31/2-(-21/4)+(-1/3)-1/4-(+1/6)=31/2-(-21/4)+(-1/3)-1/4-(+1/6)==31/2+2
31/2-(-21/4)+(-1/3)-1/4-(+1/6)=
31/2-(-21/4)+(-1/3)-1/4-(+1/6)=
31/2-(-21/4)+(-1/3)-1/4-(+1/6)=
=31/2+21/4-1/3-1/4-1/6
=186/12+63/12-4/12-3/12-2/12
=240/12=20
31/2-(-21/4)+(-1/3)-1/4-(+1/6)=
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