Х: 4/11 = 7/19 :21/19
21/19Х = 4/11х 7/19
Х = 4/11х7/19 : 21/19
Х = 4/33
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Х: 4/11 = 7/19 :21/19
21/19Х = 4/11х 7/19
Х = 4/11х7/19 : 21/19
Х = 4/33