Ответ:
x:18=7:9
9x=18*7
9x=126
x=14
6:x=3:7
3x=6*7
3x=42
5:9=15:x
5x=15*9
5x=135
x=27
12:7=60:x
12x=60*7
12x=420
x=35
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Ответ:
x:18=7:9
9x=18*7
9x=126
x=14
6:x=3:7
3x=6*7
3x=42
x=14
5:9=15:x
5x=15*9
5x=135
x=27
12:7=60:x
12x=60*7
12x=420
x=35