450-x=60*7
450-x=420
x=450-420
x=30
450-30=60*7
420=420
Ответ: 30.
480:x=100:10
480:x=10
x=480:10
x=48
480:48=100:10
10=10
Ответ: 48.
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450-x=60*7
450-x=420
x=450-420
x=30
450-30=60*7
420=420
Ответ: 30.
480:x=100:10
480:x=10
x=480:10
x=48
480:48=100:10
10=10
Ответ: 48.