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(16/10-2/3):(4/10+1/3)-(4/10:1/4)=
(28/30:22/30)-(40/100:25/100)=
(28/30*30/22)-(40/100*100/25)=
14/11-8/5=
70/55-88/55= -18/55
-18/55*55/100= -18/100= - 9/50