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2013-12-03T20:34:57+01:00
5*(5/x) = 3/4
25/x = 3/4
25 = (3/4)x
x = 25*(4/3)
x = 100/3

(3/1)*5 = 2/x
15 = 2/x
15x = 2
x = 2/15