It can be n-2 or 2-n, whichever is greater.
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If you mean the difference between -11 and 2*(-11), then it's 11.
Do you mean the difference? The difference is 13.
It does not mean anything at all. "Twice a number" is only one number while "the difference" must refer to two numbers, not just one.
the number bolts per main cap on a crankshaft journal cap. a 4 is stronger than a 2
difference = 4 - (-2) = 4 + 2 = 6