()/16=5/()=10/20=()÷56 20÷()=4/()=()/54

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()/16=5/()=10/20=()÷56 20÷()=4/()=()/54
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()/16=5/()=10/20=()÷56 20÷()=4/()=()/54
()/16=5/()=10/20=()÷56 20÷()=4/()=()/54

()/16=5/()=10/20=()÷56 20÷()=4/()=()/54
(8)/16=5/(10)=10/20=(28)÷56
20÷(25)=4/(5)=(1)/54