For which value or values are the expressions 15k+9 and 3(2k+3)+9k

Remember you can do anthing to an equaiton as long as you do it to both sides

I think you are missing a relation symbol at the end
it could be an equals though (just my guess)

For which value or values are the expressions 15k+9 and 3(2k+3)+9k equal

15k+9=3(2k+3)+9k
use distributive prpoerty which says
a(b+c)=ab+ac so
3(2k+3)=6k+9

now we have
15k+9=6k+9+9k
add like terms
15k+9=15k+9
subtract 9
15k=15k
divide 15
k=k
since this is a true statement, any number  will work for k

k=all real numbers

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.