Solving for variables is easy as all we must do is isolate the variable and simplify. In this case, to isolate the variable, we simply need to divide "n" by 10 (because the "n" is being multiplied by 10).
10n=40
/10 /10
n=4
Using the math above, we can see that n=4.
-9k-81-8
-9k-89
Hope it helps
That would be called the quotient.
We can express it at 5 (a+6)