56 - 2 = 54
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56 minus 46 = 10
It is: 2/7 minus 5/8 is = -19/56
28 - (168/2) = -56
82 minus 56 equals 16.
Each number is obtained by doubling the previous number and then subtracting a number that itself keeps doubling: 15 times 2 is 30, minus 1 is 29 29 times 2 is 58, minus 2 is 56 56 times 2 is 112, minus 4 is 108