It means to multiply the number by 2 or to add it to itself. So if the original number is 10, then double that number would be 20.
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Do you mean like a double floating point number, which is a complex number; or a double matrix type number like in the related link on springerlink.com
If 43 is one-tenth of the answer, then the answer is 430. If you divide 430 by 2, the original number was 215.
26 - 4 = 22... therefore your original number is... 11.
Let the original number be y Therefore the new number is given by the expression 2y + 6
When adding zero to anything, the sum is the original number.