X*18/13=36/39 и 42/x=6/7

Question

X*18/13=36/39 и 42/x=6/7

Answer 1

18/13х = 36/39
х = 36/39 : 18/13 = 36/39 * 13/18 = 2/3
х = 2\3

42/х = 6/7
х = ( 42*7):6
х = 49

Answer 2

Вот решение, вот решение

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