x-12
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It is possible to add 12 to any number and obtain two numbers that have a difference of 12, so there are infinitely many possible answers to that question. For example, 10 and 22 have a difference of 12; 50 and 62 have a difference of 12, etc.
The difference between 12 and 2 is 10. This is calculated by subtracting 2 from 12, which results in 10. In mathematical terms, the formula for finding the difference between two numbers is to subtract the smaller number from the larger number.
13 if you refer to a number line. If you subract you will get -1-12 = -13
12 & 3
Designate the smaller number as s. From the statement of the problem, s + s +12 = 90; or 2s = 90 -12 = 78; s = 39