Difference is a binary operator. That means it needs two numbers not just one, as in the question. You need "... difference of 12 and ..."
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-12 is less than 4 - the difference between the two numbers is 16.
16
9+(x/4)=12 x/4=3 x=12
12 * * * * * NO! It has 4 more edges.
8+4 = 12 and 8-4 = 4