6/13 - 4/12 =5/39
6/13 * 12/12 = 72/156
4/12 * 13/13 = 52/156
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....................20/156 or 5/39
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2
6 - 13 - 2 - 12 - 7 - 14 = -42
26/12 is equal to 13/6 in simplest form.
It's impossible for that to happen. 6 plus 7 is 13, not 12.
6/12 - 4/16 is equal to 1/2 - 1/4 and that is equal to 1/4