5х/12-4х/15-х/20=1
(5х*5-4х*4-х*3)/60=1
25х-16х-3х=60
6х=60
х=60/6=10
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5х/12-4х/15-х/20=1
(5х*5-4х*4-х*3)/60=1
25х-16х-3х=60
6х=60
х=60/6=10