х*1200:60=8420
х*20=8420
х=8420\20
х=421
(1980/х)\30=3
1980\х=30*3
1980\х=90
х=1980\90
х=22
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х*1200=8420*60
х*1200=505200
х=505200:1200
х=421
____________________
1980:х:30=3
1980:х=3*30
1980:х=90
х=1980:90
х=22
х*1200:60=8420
х*20=8420
х=8420\20
х=421
(1980/х)\30=3
1980\х=30*3
1980\х=90
х=1980\90
х=22