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The center where you put the similarities
f(x)=2x+2. Put in 0, 1/2, 1, 3/2, 2... and you will get integer values. That is for the domain. The numbers you get when you put that in are the range integral values.
To put two or more given values together.
Using a Venn diagram for this problem is overkill, since 6 is a multiple of 3 and will automatically be the LCM of this problem. But if you insist... Put a 3 in the left circle and put a 6 in the space where the two circles intersect.
A variable is a measurement that can take different "values". I put values in quotation marks because a variable can take qualitative values (for example, colour of eye) as well as quantitative (numerical) ones.