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800/125=800/(1000/8)=(800/1000)x8=6.4
(9.6*7/5)/9.6*1.4=9.6x(5/7)x(1/9.6)x(7/5)=1
45.6/3.8-7.6/3.8=3.8x(45.6-7.6)=144.4