algebra

9k-5-2k

First you see what numbers are the same and different... so, in my preferrence, I think it is easier if you change all the subtraction signs to addiction.. and then the number that follows change to its opposite

9k+(-5)+(-2k)

then, you add the numbers with the same variables...

7k+(-5)

now that, above, is the answer since you cannot do anything else with the numbers,because of the variable(k).

So. 9k-5-2k

is 7k+(-5)