To subtract -2 from 4, start at number 4 on a number line, and count to the right. So, \(4 - (- 2) = 6\).

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This remainder is the CRC. Note that at each step of the long division, an XOR operation is used instead of the more familiar subtraction with borrowing. This is all interesting if you want to ...

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To subtract -2 from 4, start at number 4 on a number line, and count to the right. So, \(4 - (- 2) = 6\). Same signs give a positive: \(3 + (+2) = 3 + 2 = 5\) Same signs give a positive ...