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2013-12-05T16:11:25+01:00
5/7x = 3/4
5 = 3/4 * 7x
5/7 * 4/3 = x
20/21 = x

2.4/3.5x  = 8/15                           2.4= 12/5                 3.5=7/2
12/5=8/15 * 7/2x
12/5=56/30x                   56/30 = 28/15
12/5 * 15/28 = x           
9/7=x

5/8x=40
5=320x
x=1/64