6 7 9 13 21 37 69 133 261 .......
Double the difference each time: 1 2 4 8 16 32 64 128 ......
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9X - 7 = 6 add 7 to each side 9x - 7 + 7 = 6 + 7 9X = 13 divide both sides integers by 9 (9/9)X = 13/9 X = 13/9 =========check in original equation 9(13/9) - 7 = 6 13 - 7 = 6 6 = 6 --------checks
9-6 = 3 21-13= 8 8x3 = 24
Are you trying to say 17 + 6 + (7-9) ? = 21
21 - 13 = 8... 9 - 6 = 3... 8 x 3 = 24
6 75/21 = 9 4/7.