What is four times a number added to -9 subtracted from triple the sum of nine times the number and eight?
There is nothing in the description you have given which tells
us the amount of that unspecified number, therefore, the answer
could be anything. If you want to solve for an unknown number you
need an equation. You might have said four times a number added to
-9 subtracted from triple the sum of nine times the number and
eight is equal to zero. Then we can solve the equation.