12 : 4/5х = 20 : 1/4
20*4/5х =12*1/4
4*4/1х=3*1/1
16х=3
х=3/16
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12 : 4/5х = 20 : 1/4
20*4/5х =12*1/4
4*4/1х=3*1/1
16х=3
х=3/16