11/48+13/72+(-17/48)+(-7/72)
= 11/48+13/72-17/48-7/72=
= -6/48+6/72=
=-6/48+1/12=
=-6/48+4/48=
= -2/48=
=-1/21
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= 11/48+13/72-17/48-7/72=
= -6/48+6/72=
=-6/48+1/12=
=-6/48+4/48=
= -2/48=
=-1/21