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:
. 5/x = 12/7
. x/8 = 24/96
. 15/2 = 3/x
. 2/15 = 3/x
. 3/8 = 7/x
. 5/3 = x/12
. 1/9 = x/7
. x/18 = 23/5
. 6/x = 11/4
. 12/x = 7/4

X => numar necunoscut ​