100/7=300/х
100х=300*7
100х=2100
Х=2100:100
Х=21
3/100=75/х
3х=100*75
3х=7500
Х=7500:3
Х=2500
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100/7=300/х
100х=300*7
100х=2100
Х=2100:100
Х=21
3/100=75/х
3х=100*75
3х=7500
Х=7500:3
Х=2500