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(2 3/4-1 5/9)-(5 2/3-6 3/8)=(11/4-14/9)-(17/3-51/8)=
(198/72-112/72)-(408/72-459/72)=
86/72-(-51/72)=86/72+51/72=137/72=1 65/72
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(2 3/4-1 5/9)-(5 2/3-6 3/8)=(11/4-14/9)-(17/3-51/8)=
(198/72-112/72)-(408/72-459/72)=
86/72-(-51/72)=86/72+51/72=137/72=1 65/72