How do you simplify #x + 9x + 3#?
It is important that you look at the explanation!
The expression has two groups of numbers. They are: one constant and a set of counts of
We can not mix the constant with the count of x as they are different; in that we do not know the value of
Looking at the
Adding means 'put with the count'. The opposite of this is subtract; which means 'remove from the count'.
We have one of
Putting everything together gives: